10 years of traffic volume on county roadways

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Whether it's on two-lane blacktops or bustling freeways, average traffic volume in Collin County grew by about 26 percent in the last 10 years, outpacing the county's 23-percent growth in population for the same period.

We updated our compilation of data from the Texas Department of Transportation's Annual Average Daily Traffic (AADT) counts from 2008 and 2017, using 242 matching monitoring stations across Collin County to lend a better look at traffic volume and how it's changing.

Turn up the volume

When we looked at sheer volume in 2017, 14 locations logged more than 100,000 vehicles on an average day; two brought in more than 200,000 vehicles a day. Naturally, these heavy volume location are all on the highways and toll roads that do the lion's share of moving traffic across the county. However, the volume of their growth over a decade only average about 13 percent, with a third of them actually declining in volume. 

Click on any of these charts for a full-screen view. 

Big gainers

The top 10 monitoring locations that gained the most traffic volume from 2008-2017 showed an average increase of almost 36,000 vehicles – each day. Again, these included mostly highways and toll roads, except for one: Preston Road, north of Main Street in Frisco. This intersection jumped from 24,000 in 2008 to 44,882 last year, almost doubling that volume of vehicle rolling up and down this major artery. Six of these top-10 locations ran from U.S. 75 in McKinney, just north of the Sam Rayburn Tollway, up to the White (Rd) exit in Anna.

Doubled in a Decade

We also tracked 28 locations that more than doubled in traffic volume from 2008-2017, and while not all these sites show huge numbers, a look at our graph will shore up where much of the county's growth is heading in places like Melissa, Ann, Celina, just as in McKinney, Frisco and Prosper. Moreover, traffic on Farm-to-Market roads is rising at a strong pace as these become feeders into U.S. 75 and U.S. 380.

Speaking of U.S. 380, we tracked volume growth across the breadth of the county on this roadway that showed an average increase of 27 percent over the last 10 years, from Farmersville to Prosper. Where U.S. 380 intersects with U.S. 75, the daily volume averaged almost 50,000 vehicles, to which anyone who has driven through this intersection at rush hour or lunch time in McKinney will attest. This location has increased by about 10,000 vehicles a day since 2008.

But volume increases east of McKinney, out past New Hope Road to Princeton and Farmersville, lend some attention to the growth in this part of Collin County, with 34-37 percent jumps that translate into 9,000-13,000 more vehicles a day over 10 years.

In fact, all 18 locations along U.S. 380 grew by double digits, percentage-wise, from 2008-2017 except for one: just east of the Dallas North Tollway in Prosper.

Over on U.S. 75, traffic volume dropped off a bit the last 10 years from south of Bethan Road in Allen down to Glenville Drive in Richardson.

Off the Pace

Traffic showed 29 sites where average traffic volume dropped off since 2008. Traffic data doesn't tell us exactly what caused these drops, and we're not going to guess specific causes. Construction projects from city streets to main highways have been starting and finishing for years that have a big impact on daily commuter routes. That said, the sites where traffic tailed off are a bit over 10 percent of what's going on countywide.  

So you know: All number here are pulled from where there were identical locations in 2017 as in 2008. While it's obvious that factors such a new housing development and road construction projects popping up and finishing up are having an impact on traffic routes and volume, the data doesn't speak to these issues. These are just counts and marked changes: no "spin," no selling involved. We should also mention that all the numbers mentioned here include daily averages for both directions of a street or highway; for example, a 24,000 daily average vehicle count on Road A means that roughly 12,000 vehicles are going south on Road A, and another 12,000 are going north.

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