You are asked by the city engineer to estimate the AADT on a highway using short term volume counts and data from a nearby continuous count station (using the data in Tables 4.6, 4.7, and 4.8). The city engineer gives you results of a three-hour study conducted the previous June, and asks you to combine this data with a new three-hour count you just conducted. Estimate the AADT for this road using all the available data below.
Collected on a Tuesday in June
7:00–8:00 a.m. 605
8:00–9:00 a.m. 755
9:00–10:00 a.m. 952
Collected on a Thursday in September
1:00–2:00 p.m. 1,714
2:00–3:00 p.m. 1,820
3:00–4:00 p.m. 1,844
What will be an ideal response?
The average estimated ADT from hourly expansions is
17,364 for the Tuesday in June
27,629 for the Thursday in September
Applying the daily expansion factors (Table 4.7) to these ADT estimates individually,
17,364 x 1.104 = 19,170 for the June counts
27,629 x 1.002 = 27,684 for the September counts
Applying the monthly expansion factors (from Table 4.8),
19,170 x 0.948 = 18,173
27,684 x 0.632 = 17,496
The average of the two estimates is the AADT = 17,835.
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