A traffic engineering study is being conducted on an urban four-lane arterial st

Question

A traffic engineering study is being conducted on an urban four-lane arterial street. An automatic traffic counter using a pneumatic tube detector gave a total 1-year count of 24,560,000 axles at a continuous count station. Manual classification studies at the count station indicate that the traffic stream consisted of 85% passenger cars, 10% three-axle trucks, 3% four-axle trucks, and 2% five-axle trucks. Determine the average annual daily traffic (AADT) volume (vehicles) at this count station.

Explanation / Answer

Given total number of axles count in a year = 24560000

Number of axle count on a daily basis = 24560000/365 = 67288 axles daily

Let the total number of vehicles daily be x

Number of passenger cars = 0.85x

Number of axles in a passenger car=2

Therefore, number of axles of car counted daily = 2*0.85x= 1.7x

Number of three axle trucks = 0.1x

Number of axles count = 0.3x

Number of four axle trucks = 0.03x

Number of axles count= 0.12x

Number of five axle trucks = 0.02x

Nubmer of axle count = 0.1x

Now, 1.7x+0.3x+0.12x+0.1x = 67288

x = (67288)/(1.7+0.3+0.12+0.1) = 30310

Therefore, AADT = 30310 at this station

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