1 Americans with Disabilities Act and Curb Ramps Katherine Smutzer Standards Engineer, INDOT Purdue Road School Wednesday March 9, 2016
2 Two Items to Remember All curb ramps, sidewalks and sidewalk driveway crossings will be designed and detailed in the stamped construction plans. Curb ramps, sidewalks and sidewalk driveway crossings are to be designed in accordance with the Public Rights-of-Way Accessibility Guidelines (PROWAG)
3 Why PROWAG? PROWAG Public Rights-of-Way Accessibility Guidelines (U.S. Access Board-Federally Appointed) The best practice ADA guidelines for sidewalk design within the public rights of way. It takes into account conditions unique to facilities within the public rights of way. INDOT has developed a transition plan, that identifies all the curb ramps with non-compliant elements along state facilities. This transition plan was created using the PROWAG guidelines to determine curb ramp deficiencies.
4 Why Design All Curb Ramps? All field conditions are different and very few are ideal; sufficient right of way, lack of obstructions and level terrain. Provides sufficient information for: Level One review Allows the curb ramp or sidewalk to be constructed with little to no guess work.
5 ADAAG vs. PROWAG Americans with Disabilities Act Accessibility Guidelines (ADAAG) vs. Public Rights-of-Way Accessibility Guidelines (PROWAG)
6 ADAAG vs. PROWAG There is no construction tolerance for slopes. If the cross slope is 2.00% maximum, 2.01% is not compliant. Cross Slopes Running Slopes FHWA
7 ADAAG vs. PROWAG A sidewalk adjacent to a roadway does not require a landing area or a handrail regardless of the roadway grade. There is not a limit of 5% to trigger the addition of a landing area or handrail, within the public right of way. PROWAG R302.5
8 ADAAG vs. PROWAG A landing at the top or bottom of a ramp is referred to as a turning space. Landing Turning Space Ramp Ramp Ramp Parallel Curb Ramp Perpendicular Curb Ramp PROWAG R304.2, R304.3 and R304.5
9 ADAAG vs. PROWAG The minimum width of ramp, turning space, or sidewalk is 4 ft. A 3 ft. pinch point will no longer be compliant! 4 ft. Sidewalk 4 ft. sidewalk Turning Space Ramp PROWAG R and R
10 ADAAG vs. PROWAG A detectable warning element is now a detectable warning surface. Ramp Ramp Ramp Detectable Warning Element Detectable Warning Surface PROWAG R305
11 ADAAG vs. PROWAG The part of a curb ramp that lowers the sidewalk to the street is a ramp or a blended transition. Ramp
12 ADAAG vs. PROWAG A ramp that lowers a sidewalk to the street in a public right of way is part of a Curb Ramp. They are designed differently and have different design elements and criteria than a ramp that is outside of the public right of way.
13 Curb Ramp Design What changes should you expect when designing a project using the new INDOT Standards?
14 Curb Ramp Design New Standard Drawings Series 604-SWCR Series 604-SDWK Revised Indiana Design Manual Section Rewritten Revision to Specification Book RSP 604-R-633 New Pay Items
15 Curb Ramp Design Curb Ramp Dimensions Dimensions are no longer given on the Standard Drawings. All Dimensions and slopes will be designed and shown on the construction plans.
16 Curb Ramp Design Preferred Slopes vs. Maximum Slopes (IDM) Ramp Running Slope: 8.00% preferred (8.33% maximum) Cross Slope: 1.50% preferred (2.00% maximum) Projects at Stage 2 on or after July 1, 2016 The curb ramp should be designed and detailed in the stamped construction plans with the preferred slope. Reduce the likelihood of exceeding the maximum allowable slope during construction.
17 Curb Ramp Design Curb Ramp types will no longer be referred to by a letter but rather by a name. Perpendicular curb ramp Parallel curb ramp Blended transition curb ramp Depressed corner, and Diagonal curb ramp (Prohibited for New Construction) List above is in order of INDOT preference.
22 Curb Ramp Design Depressed corner curb ramp Same as Parallel Curb Ramp
23 Curb Ramp Design Diagonal curb ramp Prohibited in New Construction Same as Perpendicular Curb Ramp
24 Curb Ramp Design Median Cut-Through PROWAG R and R
25 Curb Ramp Components Turning Space Return Curb Ramp Flared Side Clear Space Detectable Warning Surface
26 Curb Ramp Design Elements Ramp and Turning Space Width Turning Space Turning Space Length Turning Space Cross Slope Turning Space Running Slope Ramp Cross Slope Ramp Running Slope Flared Side Ramp Grade Break Return Curb Clear Space Grade Break Counter Slope Flare Slope Detectable Warning Surface Clear Space Width
27 Design Criteria Each design element has design criteria that is governed by the PROWAG.
28 Ramp Components & Design Elements Turning Space: Used where a change in direction is required. Top of a Perpendicular curb ramp Bottom of a Parallel curb ramp Bottom of a Depressed corner, and Top of a Diagonal curb ramp Minimum clear dimension of 4 ft. x 4 ft. If the back of the turning space is constrained by a curb or other feature over 2 inches, the dimension in the direction of the ramp run shall be 5 ft. A turning space may be share by two ramps. PROWAG R304.2, R304.3 and R304.5
29 Ramp Components & Design Elements Perpendicular curb ramp turning space Unconstrained 4 ft. 4 ft.
30 Ramp Component & Design Elements Perpendicular curb ramp turning space 4 ft. Constrained by Curb or Building Ramp Running Slope 5 ft. Turning Space Ramp
31 Ramp Components & Design Elements Parallel curb ramp turning space Constrained by Curb Ramp Running Slope Ramp 5 ft. Ramp Turning Space
32 Ramp Components & Design Elements Depressed corner curb ramp Turning Space
33 Ramp Components & Design Elements Diagonal curb ramp Turning Space
34 Ramp Components & Design Elements Turning Space : Cross Slope: May be equal to the grade established for the pedestrian street crossing. 4.50% preferred (5.00% maximum ) for streets with traffic signals or no stop or yield control. 1.50% preferred (2.00% maximum ) for streets with stop or yield control Equal to or less than the established street grade for midblock crossings. Running Slope: 1.50% preferred (Maximum of 2.00% ) PROWAG R302.6, R , R and R
35 Ramp Components & Design Elements Pedestrian Crossing Turning Space Cross Slope can be 1.50% Preferred
36 Ramp Components & Design Elements Pedestrian Crossing Turning Space Cross Slope can be 4.50% Preferred
37 Ramp Components & Design Elements Turning Space Cross Slope and Running Slope Cross slope grade established By the pedestrian street crossing Running slope 1.50% Preferred Pedestrian street crossing grade Direction of pedestrian travel
38 Ramp Components & Design Elements Ramp: Cross Slope: May be equal to the grade established for the pedestrian street crossing. 4.50% preferred (5.00% maximum ) for streets with traffic signals for no stop or yield control. 1.50% preferred (2.00% maximum ) for streets with stop or yield control Equal to or less than the established street grade for midblock crossings. Running Slope: 8.00% preferred (8.33% maximum) 10% for 6 curb is not acceptable Width: Minimum 4 ft. PROWAG R302.6, R , R and R
39 Ramp Components & Design Elements Ramp Design Elements: Width, 4 ft. min. Running slope 8.00% Preferred Cross slope grade established By the pedestrian street crossing Pedestrian street crossing grade Direction of pedestrian travel
40 Ramp Components & Design Elements Ramp: The ramp length need not exceed 15 ft., PROWAG R What???? On roadways that has a grade greater than about 7%, a ramp with 8.00% can cause a ramp to have a length that exceeds 15 ft. In a sense, the ramp is chasing the grade. For these situations, we suggest the ramp should not exceed 15 ft. The grade of the sidewalk outside of the ramp should not exceed the roadway grade plus 2%.
41 Ramp Components & Design Elements Ramp: 15 ft. Maximum Length One-Way Directional Ramp Profile 8.00% Preferred Sidewalk extension prevents chasing the grade.
42 Ramp Components & Design Elements Blended Transition Design Elements: Typically used to move a high volume of pedestrian traffic. Running Slope: Maximum of 2.00% or 5.00% Where a sidewalk width behind the blended transition is 4 ft. or greater, the running slope may be a 4.50% preferred (5.00% maximum). Where a sidewalk width behind the blended transition is less than 4 ft., the running slope may be a 1.50% preferred (2.00% maximum). PROWAG R304.4 and R
43 Ramp Component & Design Elements Blended Transition Design Elements: Width of sidewalk above the Blended Transition Running slope 4.50% preferred with sidewalk width above the Blended Transition 4 ft. or greater. OR, Running slope 1.50% preferred with sidewalk width above the Blended Transition less than 4 ft.
44 Ramp Component & Design Elements Blended Transition: Cross Slope: May be equal to the grade established for the pedestrian street crossing. 4.50% preferred (5.00% maximum ) for streets with traffic signals for no stop or yield control. 1.50% preferred (2.00% maximum ) for streets with stop or yield control Equal to or less than the established street grade for midblock crossings. Width: Minimum 4 ft. Length: Minimum 4 ft. PROWAG R302.6 and R
45 Ramp Component & Design Elements Blended Transition Design Elements: Width, 4 ft. minimum Length, 4 ft. minimum Cross slope grade established By the pedestrian street crossing
46 Ramp Components & Design Elements Clear Space: Minimum clear dimension of 4 ft. x 4 ft. The clear dimension shall be wholly contained within the crosswalk and wholly outside the parallel vehicular travel path. Location Bottom of a Perpendicular curb ramp Bottom of a Diagonal curb ramp Bottom of a Blended Transition Bottom of a Parallel and Depressed Corner Curb Ramp, however it overlaps with the turning space. PROWAG R
47 Ramp Components & Design Elements Clear Space Component: Clear Space 4 ft. Wholly contained within the crosswalk 4 ft. Wholly outside parallel traffic
48 Ramp Components & Design Elements Clear Space Component: 4 ft. Wholly outside parallel traffic 4 ft. Clear Space Wholly contained within the crosswalk
49 Ramp Components & Design Elements Clear Space: Wholly outside parallel traffic Wholly outside parallel traffic 4 ft.
50 Ramp Components & Design Elements Clear Space, Counter Slope Design Element: This counter slope criteria has not changed. 5% Maximum Maximum algebraic difference between the ramp, blended transition or turning space running slope and counter slope shall be 13%. Where the algebraic difference is greater than 11%, a 2 ft. minimum level strip shall be provided at the bottom of the ramp, blended transition or turning space. PROWAG R
51 Ramp Components & Design Elements Counter Slope Design Element: This will prevent a wheelchair from getting stuck between the two opposing grades. Level is 2.00% or less
52 Ramp Components & Design Elements Flared Side: 9.50% preferred running slope (10.00% maximum) Flared Side Running Slope is Parallel to the curb Flared side can be place adjacent walkable or non-walkable surface PROWAG R
53 Ramp Components & Design Elements Flared Sides Used for Paired Ramps Flared Side 3 inch Minimum Curb Height to service as a detectable edge Flared Side
54 Ramp Components & Design Elements This is a good design, there is enough room for the 9.50% flared slope to be placed and a 3 or more curb height to be developed.
55 Ramp Components & Design Elements This is NOT a good design. All flush areas of the curb must be proceed with a detectable warnings surface to indicate the crossing of a roadway.
56 Ramp Components & Design Elements Return Curb: Perpendicular to the roadway curb Return Curb Return curb can be place adjacent to a non-walkable surface only.
57 Ramp Components & Design Elements Detectable Warning Surface: For a curb ramp a detectable warning surface shall be placed at each street, highway or railroad crossing. Detectable warning surface shall extend the entire width of a ramp, Blended Transition or turning space, depending on the type of curb ramp. Detectable warning surface shall extend a minimum of 2ft. in the direction of pedestrian travel. PROWAG R305
58 Ramp Components & Design Elements Detectable Warning Surface Placement: Parallel Curb Ramp Entire width of the turning space 2 ft. Direction of pedestrian travel
59 Ramp Components & Design Elements Detectable Warning Surface Placement for Perpendicular Curb Ramp: Follow the bottom ramp grade break, straight, or Follow the back of the curb, radial < 5 ft. Parallel to ramp grade break Note: A detectable warning surface cannot cross a grade break. > 5 ft. Placed at back of curb
60 Ramp Components & Design Elements Detectable Warning Surface Placement: For Blended Transitions and Depressed Corners placed at back of curb, radial
61 Crosswalk Markings Crosswalk Markings In the revised chapter 51, there are notes that call out crosswalk markings as Preferred or Required. Preferred markings should be considered for placement. The District Traffic Engineer should be consulted. Curb ramps that only serve one direction of pedestrian travel, crosswalk markings are preferred. Required markings are mandatory. Curb ramps that serve more than one direction of pedestrian travel, crosswalks are required.
62 Crosswalk Markings Crosswalk Markings: Preferred Each curb ramp serves one direction of pedestrian traffic
63 Crosswalk Markings Crosswalk Markings: Required This curb ramp serves two direction of pedestrian travel
64 Plan Details (Retrofit) All curb ramps should be designed, how is this to be done? Resurface Projects Plan View to show neat lines of the curb ramp components Slopes and lengths of the components shown on the plan view or tabulated Spot elevations for the corners of each curb ramp component shown on the plan view or tabulated
65 Plan Details (Retrofit) Tabulate Cross Slopes and Running Slopes
66 Plan Details (New Construction) All curb ramps should be designed, how is this to be done? New Construction Projects Curb ramps labeled or called out by station and the component design criteria; slopes, widths and lengths shown in a table or detail for each curb ramp.
67 Plan Details (New Construction) Show Profile Grade of Back of Sidewalk and Curb Ramp Running Slopes
68 Plan Details (New Construction) Spot Elevation Sheet With Tabulated Elevations and General Detail Showing Cross Slope
69 Technical Infeasibility or Inquiry What if my curb ramp can not be design to meet PROWAG standards? Submit a Technical Infeasibility or Inquiry Request. Technical infeasibility and technical inquiry requests should be submitted to the Director of Highway Design & Technical Services, John Wright.
70 Technical Inquiry Technical Inquiry Request is appropriate for curb ramp retrofits, e.g. on a resurface project where purchasing right-of-way or moving utilities to fully comply with PROWAG is outside the scope of work. PROWAG Question Review a Curb Ramp Design The designer should design the curb ramp to the maximum extent possible. The proposed curb ramp should always improve the existing curb ramp.
71 Technical Inquiry Technical Inquiry Request Example A resurface project, the existing perpendicular curb ramp has ramp running slope greater than 8.33%, no turning space and a cross slope of 4%. A utility at the back of the curb ramp can not be moved without exurbanite funds being spent to put in a fully compliant perpendicular curb ramp. However the perpendicular curb ramp can be construction with a slightly less ramp running slope, a 1.50% cross slope and no turning space. This curb ramp as been designed to the maximum extent possible and improves the existing conditions.
72 Technical Infeasibility Technical Infeasibility Request is appropriate for a curb ramp that cannot be constructed to comply with PROWAG because of an obstacle that cannot be removed, e.g. a historical building. Lack of right-of-way and need for utility relocation do not meet the threshold for infeasibility. Technical infeasibility approvals will be rare. No matter what the obstacle is, the designer should try to make the curb ramp better, even if the curb ramp is not fully compliant.
73 Technical Infeasibility & Inquiry Technical infeasibility or Inquiry is approved, then what? Designer An approved technical infeasibility request should be filed with the coordination files and attached to the level one checklist. Details and notes should be added to the construction plans. An approved technical inquiry request should be filed with the design calculations and attached to the level one checklist. Details and notes should be added to the construction plans.
74 Technical Infeasibility & Inquiry Technical infeasibility or Inquiry is approved, then what? INDOT For an approved technical infeasibility, the curb ramp is removed from the Transition Plan. (Not easy to get!) For an approved technical inquiry, the curb ramp will remain on the Transition Plan but the Transition Plan will be updated to reflect any improvements made to that curb ramp.
75 Standard Specifications Section 604 Updates to Section 604 Detectable Warning Elements is now Detectable Warning Surface Pinch points may not exceed 4 ft. Defined allowable vertical discontinuities No greater than ½, ¼ or greater use a 1V:2H beveled edge. Slope percents listed not ratios No construction tolerance Contractor should check the slopes with a 2 ft. level. Help eliminate discrepancies between a 2 ft. and 4 ft. level.
76 Standard Specifications Section 604 Updates to Section 604 (Cont) Curb ramp pay item CURB RAMP, CONCRETE (SYS) Will no longer call out a Type on the pay item Detectable Warning Surface pay items Detectable Warning Surface (SYS) Detectable Warning Surface, Retrofit (SYS) Projects let on or after September 1, 2016 will need to submit the cost estimate with the new pay items listed above.
77 Curb Ramp Pay Item The curb ramps will still be paid for by the SYS, however the pay item name will not longer call out a Type. The curb ramp area will include the ramp, turning space, flared side(s), return curb(s) and detectable warning surface area. If two curb ramps share a turning space, the turning space shall only be paid for once.
78 Curb Ramp Pay Item Curb Ramp, Concrete Area
79 Curb Ramp Pay Item Detectable warning surfaces will now be paid for separately, by the SYS. For curb ramps being constructed or reconstructed with a detectable warning surface, the pay item will be Detectable Warning Surfaces (SYS) Includes the detectable warning surface, placement of the detectable warning surface, thin set mortar and fine aggregate for filling joints.
80 Curb Ramp Pay Item For a detectable warning surface being replaced or placed without curb ramp construction, the pay item will be Detectable Warning Surface, Retrofit (SYS) Includes the removal, disposal, and replacement of portions of the concrete curb ramp, concrete base, including border, detectable warning surface, placement of the detectable warning surface, thin set mortar and fine aggregate for filling joints.
81 Standard Specifications Section 604 Detectable Warning Surface Area
82 Dates to Remember July 1, 2016 Projects at stage 2 will be required to have the preferred minimum running slope and cross slope designed and shown on the plan details. September 1, 2016 Projects that let on or after September 1, 2016 will use the new pay items for Curb Ramp, Concrete and Detectable Warning Surfaces in the cost estimate. In addition all letter curb ramp callouts should be removed from the plans.
83 Two Items to Remember All curb ramps, sidewalks and sidewalk driveway crossings will be designed and detailed in the stamped construction plans. Curb ramps, sidewalks and sidewalk driveway crossings are to be designed in accordance with the Public Rights-of-Way Accessibility Guidelines (PROWAG)
84 Good or Bad?
85 Office of Standards and Policy Elizabeth Phillips Katherine Smutzer Naveed Burki
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