Basic Road Design. If you don't know where you are going, any road will get you there. Lewis Carroll
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1 Basic Road Design If you don't know where you are going, any road will get you there. Lewis Carroll
2 Road Design Horizontal alignment of a road defines its location and orientation in plan view. Vertical alignment of a road addresses its shape in profile.
3 Examine the existing topographical data. Road Design
4 Decide on the type of road and road characteristics. Freeway Expressway Arterial Collector Local Cul-de-sac Road Design istockphoto.com
5 Freeway Road designed for high speeds Possesses no at-grade intersections Intersections are separated by grade or connected by interchanges US. Department of Transportation Federal Highway Administration
6 Divided highway designed for high volumes of traffic Partial control access Expressway US. Department of Transportation Federal Highway Administration
7 Arterial Road Road designed for moderate or high volumes Lower speeds than highways and expressways Intersections with collector and local streets Commercial areas often located on arterial roads US. Department of Transportation Federal Highway Administration
8 Collector Street Low or moderate capacity road Leads traffic to activity areas within a community Intersects with arterial roads and local roads US. Department of Transportation Federal Highway Administration US. Department of Transportation Federal Highway Administration
9 Side road Low capacity Low speed Typically located in residential neighborhoods Local Road US. Department of Transportation Federal Highway Administration
10 Cul-de-sac Dead end street with only one ingress/egress Created to limit through traffic wikimedia
11 Intersections Streets shall be designed to intersect at right angles whenever possible. Many road codes will not allow streets to intersect at angles less than 75 degrees. A school bus has a difficult time turning and swings out over the other lane when the radius is less than 90 degrees. 75º min.
12 Intersections Modern roundabouts are becoming more common. Roundabouts can reduce delay and increase safety. Roundabouts are designed to slow entering traffic and allow all traffic to flow through the junction freely and safely. US. Department of Transportation Federal Highway Administration
13 Point of Intersection (PI) The point at which two or more roads intersect PI istockphoto.com
14 Sight Distance The distance from which an object at eye level remains visible Road codes require different sight distances at intersections depending upon the design speed Takes into account average perception and reaction times, braking distance, and condition of pavement istockphoto.com
15 Horizontal Curves Horizontal curves connect intersecting straight sections of roads Point where the straight sections intersect is also called a PI The larger the radius, the flatter the curve Most municipalities require a radius greater than 125 feet for a 20 mph street PI istockphoto.com R = 125 min
16 Elements of a Simple Circular Curve Δ
17 Length of a Curve The distance from PC to PT is the length of the curve, which is calculated using the formula below. L R = π Δ 180
18 Degree of Curvature, D Like the radius, the degree of curvature is a measure of the sharpness of a curve. The degree of curvature is the angle formed by two radii drawn from the center of the circle to the ends of a chord 100 feet in length for a given radius. D = R 100 R R D
19 Complete curve data must be calculated for every curve on the road. Curve Data
20 Station Numbers In order to define the location of a road, stations numbers are used. Station 1+50 would be 150 feet from the beginning of the road. Station 3+25 would be 325 feet from the beginning of the road. The distance from Sta to Sta is feet.
21 All significant points (PI, PC, and PT) must be identified on the road plan. The curve length is used to find the station number of each PC and PT. Station Numbers
22 Vertical Road Alignment Roads must be aligned to the topography of the site for smooth, safe driving. To prevent abrupt changes in grade, vertical curves are used. Unlike horizontal curves, vertical curves are parabolic arcs.
23 Crest Vertical Curves A crest vertical curve is used at the top of a summit. The length of the curve is determined by two factors: stopping sight distance and rider comfort. If the curve is too short, then cars approaching the summit could become airborne. Drivers also need enough time to stop in case of debris on the road. S =Sight distance Object
24 Sag Vertical Curves A sag vertical curve is used at the bottom of a curve. Sag curves are also designed for sight distance and rider comfort. The sight distance is determined by the illuminated area from the average car headlight beam. If the curve is too short, then a car will bottom out.
25 Elements of a Vertical Curve A vertical curve has two slopes or grade lines. The two grade lines are called the back tangent (g1) and forward tangent (g2). The intersection point is the point of vertical intersection. (PVI). The beginning of the curve is the point of vertical curve (PVC). The end of the curve is the point of vertical tangent (PVT). g2 g1
26 Road Design To create the vertical profile of the road, lines are projected from the station points and an exaggerated vertical scale is created. Elevation data from existing station points are plotted to a graph.
27 Road Design A straight line is plotted through the points. Vertical curves are added between slopes. The station numbers for PVC and PVT are computed.
28 Road Profile NEED Permission
29 Road Charts Important data for the construction of the road is contained in a road chart. Stations every 100 feet as well as all important points are included on the chart.
30 Road Chart Station 0+00 Begin Project Transit line for Project Road from Lead The Way Boulevard (N 90º W) N3º37 W FROM BM to centerline of Project Road Setting up a chart for survey data and control points
31 Road Chart 90.0 BM Station 0+00 Begin Project STA Transit line for Project Road from Lead The Way Boulevard (N 90º W) N3º37 W FROM BM to centerline of Project Road P.C to the left Curve Data R = 125 _=59º L = D=45.83º
32 Road Chart 90.0 BM Station 0+00 Begin Project STA STA Transit line for Short Cut Drive from Project Road (Bearing N 25 3' E) to Lead The Way Boulevard (N 0 4' W) N3º37 W FROM BM to centerline of Project Road P.C to the left Curve Data R = 125 _=59º L = D=45.83º P.T.
33 Road Chart Continue adding information in this manner until you arrive at the end of the road. Station 0+00 Begin Project STA STA STA STA STA Transit line for Project Road from Lead The Way Boulevard (N 90º W) N3º37 W FROM BM to centerline of Project Road P.C to the left Curve Data R = 125 _=59º L = D=45.83º P.T. P.C. to the right Curve Data R = 200 _=42º L = D = P.T. P.I. at Big Road
34 Resources U.S. Department of Transportation Federal Highway Administration.(n.d.). Flexibility in Highway Design. Retrieved December 15, 2009, from
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