Chapter 6 _4_

# Chapter 6 _4_ - DESIGN TRAFFIC VOLUMES How to select a...

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DESIGN TRAFFIC VOLUMES How to select a design-hourly volume? Problem: Variability in traffic volumes by time of day, day of week, time of year, and type of roadway.

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Examples of hourly variation Percent of Daily Traffic T im e o f D a y In tr a c ity R o u te - 2 .0 4 .0 6 .0 8 .0 1 0 .0 1 2 :0 0 A M 6 :0 0 A M 1 2 :0 0 P M 6 :0 0 P M 1 2 :0 0 A M In t e r c it y R o u te - 2 .0 4 .0 6 .0 8 .0 1 0 .0 1 2 :0 0 A M 6 :0 0 A M 1 2 : 0 0 P M 6 :0 0 P M 1 2 :0 0 A M
Monthly Traffic Volume Variations 60 70 80 90 100 110 120 130 140 150 Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec. Month Monthly Average Daily Traffic as Percent of AADT AADT

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Work with percentages of the annual average daily traffic (AADT) AADT is in units of vehicles per day (for both travel directions) and computed as the total yearly traffic volume divided by the number of days in the year. Convert AADT into Design Hourly Volume
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Chapter 6 _4_ - DESIGN TRAFFIC VOLUMES How to select a...

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