Use the data provided in Problem 9-16 to estimate the ATS in each direction. Base free flow speed: 55 mi/h; lane width: 11 ft; shoulder width: 3 ft; access points per mile: 15.

What will be an ideal response?


Step 1: Equation 9.9, estimate free flow speed. Adjustment coefficients fLS and fA from Tables 9.12 and 9.13, respectively.



Step 2: Estimate heavy vehicle adjustment factor, use Equation 9.11:



Step 3: Estimate demand volume for each direction. Use Equation 9.10.



Step 4: Estimate ATS for each direction. Use Equation 9.13. Adjustment factors

for no-passing zones interpolated from Table 9.20.



a) For 60% traffic (660 veh/h)



b) For 40% traffic (440 veh/h)

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