15. HIGHWAY IMPROVEMENT GUIDES AND POLICIES

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1 15. HIGHWAY IMPROVEMENT GUIDES AND POLICIES Introduction The design of roadways must ensure the safe and efficient movement of vehicles. In order to accomplish this objective, design should be based on sound engineering practices of the time. Some typical guides and policies used in design are listed as follows: Policies Guides 1. A Policy on Geometric Design of Highways and Streets, American Association of State Highway and Transportation Officials, (Noted in text as the AASHTO Green Book). 2. Manual on Uniform Traffic Control Devices for Streets and Highways, U.S. Department of Transportation, Federal Highway Administration, AASHTO Interim Guide for Design of Pavement Structure, American Association of State Highway and Transportation Officials, Transportation and Traffic Engineering Handbook - Second Edition, Institute of Traffic Engineers, Uniform Standard Specifications for Public Works Construction and Uniform Standard Details for Public Works Construction, Maricopa Association of Governments, , together with current revisions as accepted by the Maricopa County Board of Supervisors together with Board approved supplements thereto. 6. ADOT Standards and Specifications: Standard Drawings Roadway Part (1) Construction Details, Plans Services, Part (2) Structures, Structures Section, Part (3) Traffic Signals and Lighting, Traffic Engineering, Part (4) Signing and Marking, Traffic Engineering, Roadway Guides for use in Field and Office (Design Standards), Plans Services, Drafting Guides for use in Office and Field, Plans Services, General Specifications for Traffic Signals, Traffic Engineering, Arizona Counties Highways Manual 15-1 Revised 2004

2 Standard Specifications for Road and Bridge Construction, Contracts & Specifications, It is important to note that for all Federal Aid projects, the Federal Highway Administration's position on project implementation makes reference to the AASHTO Green book regarding thirteen controlling design criteria: 1. Design Speed 2. Lane Width 3. Shoulder Width 4. Bridge Width 5. Structural Capacity 6. Horizontal Alignment 7. Vertical Alignment 8. Grades 9. Stopping Sight Distance 10. Cross Slope 11. Superelevation 12. Horizontal Clearance 13. Vertical Clearance Deviations from the AASHTO Green Book will require a formal "design exceptions" approval from the Federal Highway Administration. Chapter 11, Traffic Control, deals specifically with design guides and policies for traffic control, which is not covered in this chapter. Reference guides and policies for safety studies are discussed in Chapter 12, Traffic Safety. Street Classifications Street classifications are necessary in transportation planning and design. In transportation planning, the use of a functional classification scheme enables a balanced transportation system to be provided. Balance refers to the relationship between the degree of through movement on the street and the degree of access to adjoining properties provided. With respect to design, the use of a functional classification system aids in determining which design guides to use in the determination of cross sections, spacing of driveways, number of median openings, spacing of intersections, etc. After a road or street has been classified, a design speed must be set before any design can be started. The design speed is described in the following section. The functional classification system most commonly used is based on the Federal Highway Administration publication, Highway Functional Classification: Concepts, Criteria, and Procedures. The classification scheme is excerpted from this publication and from the ITE Transportation and Traffic Engineering Handbook: Urban principal arterial system. Streets and highways serving major metropolitan activity centers, the highest traffic volume corridors, the longest trip desires, and a high proportion Arizona Counties Highways Manual 15-2 Revised 2004

3 of total urban area travel on a minimum of mileage. Service to abutting land should be subordinate to the provision of travel service to major traffic movements. This system carries the major portion of trips entering and leaving an urban area, as well as the majority of through movements desiring to bypass the central city, and normally will carry important intraurban as well as intercity bus routes. Urban minor arterial street system. Streets and highways interconnecting with and augmenting the urban principal arterial system and providing service to trips of moderate length at a somewhat lower level of travel mobility. The system places more emphasis on land access and distributes travel to geographic areas smaller than those identified with the higher system. It includes all arterials not classified as principal. Urban collector street system. Streets penetrating neighborhoods, collecting traffic from local streets in the neighborhoods, and channeling it into the arterial systems. A minor amount of through traffic may be carried on collector streets, but the system primarily provides land access service and carries local traffic movements within residential neighborhoods, commercial and industrial areas. It may also serve local bus routes. Urban local street system. Streets not classified in a higher system, primarily providing direct access to abutting land and access to the higher systems. They offer the lowest level of mobility and usually carry no bus routes. Service to through traffic is deliberately discouraged. Rural principal arterial system. A connected rural network of continuous routes having the following characteristics: 1. Serves corridor movements having trip length and travel density characteristics indicative of substantial statewide or interstate travel 2. Serves all, or virtually all, urban areas of 50,000 and over population, and a large majority of those with population of 25,000 and over 3. Provides an integrated network without stub connections except where there are unusual geographic or traffic flow conditions The rural principal arterial system is further divided into interstate and other principal arterials. Rural minor arterial road system. Routes whose design should be expected to provide relatively high overall travel speeds, with minimum interference to through movement, and all remaining routes on the rural network not included as "rural principal" having the following characteristics: 1. Links cities and larger towns and other traffic generators, for example, major resort areas that are capable of attracting travel over long distances and forms an integrated network providing interstate and inter-county service. 2. Spaced at such intervals, consistent with population density, that all developed areas of the state are within reasonable distances of an arterial highway. 3. Provides service to corridors with trip lengths and travel density greater than those predominantly served by rural collectors or local systems. 4. Integrates interstate and inter-county services. Arizona Counties Highways Manual 15-3 Revised 2004

4 Rural collector road system. Routes generally serving intra-county rather than statewide travel and on which average trip lengths and travel speeds are less than on arterial routes. The rural collector road system is subdivided into major collector roads and minor collector roads. Major Collector Roads: 1. Serve county seats not on arterial routes, larger towns not directly served by the higher system, and other traffic generators of equivalent intracounty importance, such as consolidated schools, shipping points, county parks, and important mining and agricultural areas. 2. Link these places with nearby larger towns or cities, or with routes of higher classifications; and 3. Serve the more important intracounty travel corridors. Minor Collector Roads: 1. Be spaced at intervals consistent with population density to accumulate traffic from local roads and bring all developed areas within reasonable distance of collector roads; 2. Provide service to the remaining smaller communities; and 3. Link the locally important generators with their rural hinterland. Rural local road system. Routes generally serving to provide access to adjacent land and provide service to travel over relatively short distances as compared to collectors or other higher systems and not classified in a higher system. Urban principal arterial system. Streets and highways serving major metropolitan activity centers, the highest traffic volume corridors, the longest trip desires, and a high proportion of total urban area travel on a minimum of mileage. Service to abutting land should be subordinate to the provision of travel service to major traffic movements. This system carries the major portion of trips entering and leaving an urban area, as well as the majority of through movements desiring to bypass the central city, and normally will carry important intraurban as well as intercity bus routes. After a road or street has been classified, a design speed must be set before any design can be started. The design speed is described in the following section. Design Speed Design speed is defined by AASHTO as "a selected speed used to determine the various geometric design features of the roadway. the maximum safe speed that can be maintained over a specified section of highway when conditions are so favorable that the design features of the highway govern." The assumed design speed should be a logical one with respect based on to the topography, anticipated operating speed, the adjacent land use, and the functional classification of highway. Every effort should be made to use as high a design speed as practical to attain a desired degree of safety, mobility, and efficiency within the constraints of environmental quality, economics, aesthetics, and social or political impacts. The design speed must be set before any design can be Arizona Counties Highways Manual 15-4 Revised 2004

5 started, because design elements are related to the design speed in order to obtain a balanced design in terms of driving safety, comfort, and mobility. The design speed chosen should be consistent with the speed based on a functional classification of the highway facility. Some features, such as curvature, superelevation, and sight distance, are directly related to, and vary appreciably with, design speed. The AASHTO Green Book should be consulted for the design speed as one of as the primary controlling design factor. criteria. Street Design Elements Sight Distance One of the most basic controlling design elements is the provision of adequate sight distances. As the AASHTO Green Book states, "For safety on highways the designer must provide sight distance of sufficient length that drivers can control the operation of their vehicles to avoid striking an unexpected object on the traveled way." For safety on highways, the designer should provide sight distance of sufficient length that drivers can control the operation of their vehicles to avoid striking an unexpected object in the traveled way. The roadway classification is an important criteria in determining how much sight distance needs to be provided. For example, on a two-lane rural highway, passing sight distance should be frequently provided. The AASHTO Green Book discusses sight distance in four steps: provides information on determining the following sight distances needed for safe design and operation. (1) the distances required for stopping, applicable on all highways; (2) the distances required for the passing of overtaken vehicles, applicable only on two-lane highways; (3) the distances needed for decisions at complex locations; and (4) the criteria for measuring these distances for use in design." Types of sight distances include: 1. Stopping 2. Passing 3. Entering or crossing a through street from a stop 4. Entering or crossing a through street from a yield 5. Entering an uncontrolled intersection. 6. Making a left-turn from the major road onto the minor road. It is important to note that vertical heights for sight distances have changed over the years. The new stopping sight distance is to a 2-foot high object in the road. The driver s eye height is 3.5 feet above the pavement. The heights of approaching vehicles or to cars being passed are 3.5 feet above the pavement. Horizontal Alignment Arizona Counties Highways Manual 15-5 Revised 2004

6 Horizontal alignment refers to tangents and horizontal curves. From the AASHTO Green Book, p. 131, proper design of horizontal curves depends on the following relationship among vehicle speed, rate of roadway super- elevation, vehicle side friction, and the radius of the curve: e + f = V2 0.01e + f V 2 15R ef 15R where: e = rate of roadway superelevation, ft/ft; f = side friction factor; V = vehicle speed, mph; and R = radius of curve, ft. The AASHTO Green Book states that, From accumulated research and experience, limiting values have been established for e and f. Using emax value with a conservative f value in the basic formula permits determination of minimum curve radii for various design speeds. For a given design speed, use of curves with radii longer than the minimum calls for balance in the factors involved to determine the desirable superelevation rates below the maximum. From accumulated research and experience, limiting values for superelevation rate (e max ) and side friction demand (f max ) have been established for curve design. Using these established limiting values in the basic curve formula permits determination of a minimum curve radius for various design speeds. Use of curves with radii larger than this minimum allows superelevation, side friction, or both to have values below their respective limits. An e max should be determined for an area and used on all designs of similar roads within that area. This makes two similarly sharp curves drive the same and feel the same to both the driver and passengers. Therefore, an engineer must research the correct values to use for the vation, and side friction factor, based on the design speed. Also, there are a number of general controls recognized in practice. The engineer should refer to the AASHTO Green Book for a discussion of these controls Vertical Alignment Vertical alignment refers to tangent grades and vertical curves. Maximum grades are related to the effect on truck speeds. Guidelines are available regarding grade controls for each functional class of highway. It is also necessary to consider the "critical length of grade" which is the "maximum length of a designated upgrade on which a loaded truck can operate without an unreasonable reduction in speed." The AASHTO Green Book describes the procedure to determine design values for critical length of grade. Vertical curves are either sag or crest types. The main criteria in designing vertical curves is the provision of adequate sight distance. Specific and general design controls and formulas for computing the length of curves are found in the AASHTO Green Book. Crest vertical curves are controlled by the driver's eye height (3.5 feet) and an object height ( feet) and the driver Arizona Counties Highways Manual 15-6 Revised 2004

7 being able to see the object over the hill and stopping before hitting it. The sag vertical curve is controlled by what the headlights will illuminate. hit. Combination of Horizontal and Vertical Alignment It is important that horizontal and vertical roadway components be designed together, as they complement each other. General design controls are excerpted from the Green Book: 1. Curvature and grades should be in proper balance. Tangent alignment or flat curvature at the expense of steep or long grades and excessive curvature with flat grades are both represent poor design. A logical design that offers the best most in combination of safety, capacity, ease and uniformity of operation, and pleasing appearance within the practical limits of terrain and area traversed is a compromise between the two extremes. 2. Vertical curvature superimposed on horizontal curvature, or vice versa, generally results in a more pleasing facility, but such combinations it should be analyzed for their effect on traffic. Successive changes in profile not in combination with horizontal curvature may result in a series of humps visible to the driver for some distance that, as previously discussed, represents an undesirable condition. a hazardous condition as previously discussed. The use of horizontal and vertical alignments in combination, however, may also result in certain undesirable hazardous arrangements, as discussed later in this section. below. 3. Sharp horizontal curvature should not be introduced at or near the top of a pronounced crest vertical curve. This condition is undesirable hazardous in that because the driver may not cannot perceive the horizontal change in alignment, especially at night. when the headlight beams go straight ahead into space. The disadvantages hazard of this arrangement is are avoided if the horizontal curvature leads the vertical curvature (i.e., the horizontal curve is made longer than the vertical curve). Suitable designs can also be developed made by using design values well above the appropriate minimum values for the design speed. 4. Somewhat related to the preceding guideline, allied to the above, sharp horizontal curvature should not be introduced at or near the bottom of a steep grade approaching or near the low point of pronounced sag vertical curve. Because the view of the road ahead is foreshortened, any but flat horizontal curvature other than a very flat curve assumes an undesirable distorted appearance. Furthermore, vehicular vehicle speeds, particularly of for trucks, are often are high at the bottom of grades, and erratic operations may result, especially at night. 5. On two-lane roads and streets, the need for safe passing sections at frequent intervals and including for an appreciable percentage of the length of the roadway Arizona Counties Highways Manual 15-7 Revised 2004

8 often supersedes the general guidelines desirability for combination of horizontal and vertical alignment. In such these cases, it is appropriate necessary to work toward long tangent sections to ensure secure sufficient passing sight distance in design. 6. Both horizontal curvature and profile should be made as flat as practical feasible at intersections where sight distance along both roads or streets is important and vehicles may have to slow or stop. 7. On divided highways and streets, variation in width of median and the use of independent separate profiles and horizontal alignments for the separate oneway roadways are sometimes desirable. should be considered to derive design and operational advantages of one-way roadways. Where traffic justifies provision of four lanes, a superior design without additional cost generally results from such practices. the concept and logical design basis of one-way roadways. 8. In residential areas, the alignment should be designed to minimize nuisance factors to the neighborhood. Generally, a depressed facility makes a highway less visible and less noisy to adjacent residents. Minor horizontal adjustments can sometimes be made to increase the buffer zone between the highway and clusters of homes. 9. The alignment should be designed to enhance attractive scenic views of the natural and manmade environment, such as rivers, rock formations, parks, and outstanding structures. buildings, and golf courses. The highway should head into, rather than away from, those views that are outstanding; it should fall toward those features of interest at a low elevation, and it should rise toward those features best seen from below or in silhouette against the sky. The ADOT publication, Roadway Guides for use in Office and Field, lists useful design guides for designing curves and other geometric design criteria. Cross Section The AASHTO Green Book is the source for controlling criteria such as lane widths, shoulder widths, and bridge widths. Other cross-sectional elements include pavement specifications, curbs, walkways, drainage channels, traffic barriers, medians, frontage roads, and outer separations. Additional considerations may include noise control, roadside control, tunnels, pedestrian crossings, bicycle facilities, bus turnouts, and on-street parking. Design considerations regarding these elements may be found in the AASHTO Green Book, and also in the ADOT Construction Standard Drawings. Intersection Design Elements The main objective of intersection design is to reduce the number of conflicts among vehicle and pedestrian movements. The AASHTO Green Book lists the following basic elements that enter into design considerations of at-grade intersections: Arizona Counties Highways Manual 15-8 Revised 2004

9 A. Human factors 1. Driving habits 2. Ability to make decisions 3. Driver expectancy 4. Decision and reaction time 5. Conformance to natural paths of movement 6. Pedestrian use and habits 7. Bicycle traffic use and habits B. Traffic considerations 1. Design and actual capacities 2. Design-hour turning movements 3. Size and operating characteristics of vehicle 4. Variety of movements (diverging, merging, weaving, and crossing) 5. Vehicle speeds 6. Transit involvement 7. Crash Accident experience 8. Bicycle movements 9. Pedestrian movements C. Physical elements 1. Character and use of abutting property 2. Vertical alignment at the intersection 3. Sight distance 4. Angle of the intersection 5. Conflict area 6. Speed-change lanes 7. Geometric features 8. Traffic control devices 9. Lighting equipment 10. Safety features 11. Bicycle traffic 12. Environmental factors 13. Crosswalks D. Economic factors 1. Costs of improvements 2. Effects of controlling or limiting rights-of-way on abutting residential or commercial properties where channelization restricts or prohibits vehicular movements 3. Energy consumption Arizona Counties Highways Manual 15-9 Revised 2004

10 E. Functional Intersection Area Safety and Other Design Considerations In Chapter 12, Traffic Safety, a program for determining hazardous roadway locations was described. The results of these studies should be used as a basis for determining needed safety improvements. The following table, excerpted from NCHRP Report No. 162, Methods for Evaluating Highway Safety Improvements, lists a number of potential improvement strategies: EXAMPLE CHECKLIST OF POTENTIAL IMPROVEMENTS Sections o Eliminate parking o Install delineators o Add guardrail to protect embankments o Add guardrail to protect fixed objects o Remove fixed objects o Flatten fill slopes o Add painted or raised median o De-slicking, improving skid o resistance o Resurfacing o Widen traveled way o Reconstruction o Install or improve edge marking o Install or improve warning and/or directional signs o Install median barrier o Breakaway sign and light standards o Install lighting o Shoulder stabilization o Widen shoulders o Eliminate median crossovers o Add climbing lanes Curves o Install delineators o Add guardrail o Resurfacing o Install warning signs o Reconstruct curve o Provide adequate superelevation Bridge/Underpass o Install delineators o Install lighting o Energy absorption devices o Add guardrails, bridge approach rail and flare o Bridge widening Intersections o Install or improve warning o Install stop ahead signs and/or directional signs o Install yield sign o Install minor leg stop control o Install all-way stop signs o Install lighting o Install warning signals o Install pedestrian signals o Curtail left-turn movements o Improve signals o Provide for left-turn o Install new signals movements Arizona Counties Highways Manual Revised 2004

11 o Install warning signals o De-slicking, improve skid resistance o Install rumble strips Social, Economic, and Environmental Impacts of Design In order to evaluate alternative designs, it is important to consider how each facility will impact the surrounding community and how cost effective each alternative is. For projects requiring federal funding, an environmental assessment must be prepared. If significant social, economic, or environmental effects are found, then a more detailed environmental impact statement must be prepared. The contents of a draft environmental assessment are summarized as follows: Draft Environmental Assessment Part 1. Need for the Proposed Action: Existing facility, if any; land use; current and projected traffic data, etc. Part 2. Description of the Proposed Action Project location, include appropriate maps; description of design parameters and major design features; tentative costs and construction schedule, etc. Part 3. Alternatives Considered The Do-Nothing alternative and other alternatives studied; include appropriate map(s). Part 4. Social, Economic and Environmental Effects of the Proposed Action Adverse and beneficial effects upon the human environment, with special consideration to involvements regarding public parks, recreation and wildlife areas, historic and archaeological properties, and minority groups (Reference Title VI); include basis for the negative impact declaration. Part 5. Coordination with Other Agencies and the Public Coordination during the study process; public forums, where applicable, etc.; anticipated future coordination by way of public forums, public hearings, etc. Final Environmental Assessment Add any project revisions and public hearing data to above Draft Environmental Assessment; indicate the selected alternate(s). As applicable, the following social, economic and environmental considerations should be discussed. Arizona Counties Highways Manual Revised 2004

12 a. Land Use (existing and proposed) b. Land Ownership c. Social (includes schools, churches, medical facilities, police, fire houses, residences, relocations, etc.) d. Economics (includes commercial and industrial enterprises, employment, local tax base, etc.) e. Minority (neighborhoods, businesses, residences, etc.) f. Natural Resources (water, lands, air, etc.) g. Section 4(f) (parks, recreation, wildlife refuges, lakes, streams, school playgrounds, etc.) h. Cultural Resources (includes historical and archaeological) i. Farmlands (prime, unique, statewide importance) j. Water Quality k. Section 404 (dredged and fill materials) l. Endangered Species (plants and wildlife) m. Native Plants (State Native Plant Law) n. Floodplains o. Wetlands p. Air Quality Report q. Noise Study Report r. Wild and Scenic Rivers s. Natural Areas and Trails t. Scenic Roads and Parkways u. Local Traffic Pattern v. Existing and any additional right-of-way w. Energy Usage x. Construction Impacts (of temporary nature) y. Pedestrian/Bicycle/Equestrian Facilities z. Visual Qualities a.a. Material Pits and Haul Roads a.b. Utilities a.c. Erosion Control a.d. Other Modes of Transportation a.e. Sole Source Aquifer Agencies to contact during preparation of environmental studies are discussed in Chapter 8, Intergovernmental Relations. Standards for Parkways and Historic and Scenic Roadways The Arizona Revised Statutes allow an exemption from normal construction standards on parkways, historic, and scenic roadways, as long as the roads provide safe travel facilities. A.R.S , "Exemption from standards for parkways and historic and scenic roads," reads as follows: "To ensure the protection and enhancement of the special features for historic roads, parkways and scenic roads, the department of transportation, the Federal Highway Administration, the county or the city may allow an exemption from the standards normally applied to the construction and maintenance of the roads and Arizona Counties Highways Manual Revised 2004

13 parkways. Revised construction and maintenance procedures for such designated roads and parkways may be developed to reasonably provide for the safety and service of the traveling public." REFERENCES 1. ADOT Standards and Specifications: Standard Drawings Part (1) Construction Details, Plans Services, Part (2) Structures, Structures Section, Part (3) Traffic Signals and Lighting, Traffic Engineering, Part (4) Signing and Marking, Traffic Engineering, Arizona Counties Highways Manual Revised 2004

14 Roadway - Roadway Guides for use in Field and Office (Design Standards), Plans & Services, Drafting Guides for use in Office and Field, Plans Services, General Specifications for Traffic Signals, Traffic Engineering, Standard Specifications for Road and Bridge Construction, Contracts, & Specifications, AASHTO Interim Guide for Design of Pavement Structures, American Association of State Highway and Transportation Officials, Washington, D.C., Manual on Uniform Traffic Control Devices for Streets and Highways, Revised , U.S. Department of Transportation, Washington, D.C., , vp. 4. A Policy on Geometric Design of Highways and Streets, American Association of State Highway and Transportation Officials, Washington, D.C., Traffic Control Devices Handbook (GPO ), Federal Highway Administration, Washington, D.C., , vp. 6. Transportation and Traffic Engineering Handbook, 2nd Edition, Institute of Traffic Engineers, Washington, D.C., Uniform Standard Specifications for Public Works Construction and Uniform Standard Details for Public Works Construction, Maricopa Association of Governments, , together with current revisions as accepted by the Maricopa County Board of Supervisors together with Board approved supplements thereto. Arizona Counties Highways Manual Revised 2004

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