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Clear Zone RDG Chapter 3. What is a Clear Zone? Clear Zone: A Clearer Definition A traversable area that starts at the edge of the traffic lane, includes.

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Presentation on theme: "Clear Zone RDG Chapter 3. What is a Clear Zone? Clear Zone: A Clearer Definition A traversable area that starts at the edge of the traffic lane, includes."— Presentation transcript:

1 Clear Zone RDG Chapter 3

2 What is a Clear Zone?

3 Clear Zone: A Clearer Definition A traversable area that starts at the edge of the traffic lane, includes the shoulder, and extends laterally a sufficient distance to allow a driver to stop or return to the road before encountering a hazard or overturning Clear Zone Traffic Lane Shoulder

4 Clear Zone Influence Factors Roadway Design Speed Traffic Volume Embankment slope Horizontal Curvature of the roadway

5 Minimum Clear Zone Distances

6 Slopes and the Clear Zone

7 Steepness Categories of Slopes Recoverable - 1:4 or Flatter ** Non-Recoverable: 1:3 to 1:4 ** Critical: Steeper than 1:3 **Traversable

8 Recoverable 1 4 (Traversable)

9 Non-Recoverable ( Traversable )

10 Critical (Not Traversable) 3 1

11 Horizontal Curves and the Clear Zone

12 Table 3.2 Horizontal Curve Adjustments RadiusDesign Speed (mph) (ft) XX XX XX XX XX XX XX XX XX

13 Figure 3.6: VEE DITCHES Figure 3.6

14 Clear Zone Case Studies

15 Country road

16 Pavement markings

17 Add edge lines

18 Geometric and roadside inconsistency

19 Maintain Consistency In Roadway Design Don't Surprise The Driver!! Dont surprise the driver

20 Optimum design


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