Highest traffic counts in your city?

[dariusb]

Hope this is the right forum for this topic but, what are the highest traffic counts in your city? In my hometown (Texarkana) it's 88,000 vpd(vehicles per day) on I-30. In my current city (Killeen) it's over 100,000 on I-14.

[CtrlAltDel]

The highest I've found in Chicago is 327,000 on I-90/I-94 at the Skyway split. There are a few others places with more than 200,000 including pretty much the whole of I-90/I-94 in the city as well as bits of I-290 and I-294.

[NWI_Irish96]

So there is about 3/8 of a mile of I-80/94/US 6 that cuts through the northwestern corner of Munster, and it gets 204,104. 

[US 89]

The highest traffic counts in the Salt Lake City area (and all of Utah, for that matter) are on I-15/80 between SR-201 and I-80, clocking in at 300,000. (Technically that is in South Salt Lake, but whatever.) I-15 is consistently above 200k between 10600 South and 400 South, as well as between SR-52 and Pleasant Grove Blvd in Utah County. There may be a few more isolated segments in the south valley as well.

[sprjus4]

In Chesapeake, tops off at 147,000 AADT on I-64 between Greenbrier Pkwy and the Virginia Beach city limits.

Going a little off the main topic for my specific city, but for the whole Hampton Roads area (Southside & Peninsula), it would be in Virginia Beach on I-264 east of the I-64 interchange at 221,000 AADT.

[Big John]

Green Bay area (Ashwaubenon/Allouez), 98,500 on WI 172 over the Fox River.

[thspfc]

Madison: 100-120k on the Beltline.

[Max Rockatansky]

Apparently 112,000 vehicles a day on CA 41 north of CA 180 in Fresno.  Not bad for a city with over 500,000 residents.

[Beltway]

Richmond VA

I-95 just north of I-64 downtown interchange

163,000
5% large trucks

[webny99]

Assuming "city" is not to be taken too literally. Around here, anything over 100K VPD is considered high.

I believe the highest (and, not coincidentally, also the most incident-prone, especially in the afternoon rush), is I-490 between exits 21 and 22. That stretch carries around 125K VPD. It's nine lanes in total, four EB and five WB.

[tdindy88]

For Indianapolis it would be I-465 on the east side between I-70 and Pendleton Pike where the traffic count is between 170,000 and 185,000 VPD. Appropriately it's one of the widest stretches of freeway in the city.

[debragga]

Monroe, LA has 84k on I-20. Just across the river in West Monroe the highest is 95k.

[ozarkman417]

72,000 on US 65 (Schoolcraft Freeway) between Battlefield Road and James River Freeway (US 60/BUS US 65)

[doorknob60]

In Boise (and Meridian, this segment is in both cities) it's 139,000 on I-84 between Eagle Rd/ID-55 and I-184. Also the highest in all of Idaho. I'm glad my normal commute no longer takes me through this segment.

[Bruce]

Seattle: I-5 in downtown (including the express lanes) is about 274,000 vehicles per day.

And for streets: SR 99 south of the Spokane Street Viaduct (on East Marginal Way South) gets 62,000 vehicles. The other end of SR 99 on the north side of the Aurora Bridget gets close, at 58,000.

And within downtown: Mercer Street has 66,100 in the approach to I-5.

And the highest count for a non-downtown non-numbered street: 15th Avenue West (on the Ballard Bridge) gets 59,200.

[pianocello]

In the Orlando area, it looks like the stretch of I-4 between Disney World and SR 528 (to the airport) is at 235K vehicles per day.

[dariusb]

In the Orlando area, it looks like the stretch of I-4 between Disney World and SR 528 (to the airport) is at 235K vehicles per day.

I bet traffic all along I-4 between Tampa and Orlando is crazy.

[Echostatic]

In Austin, the highest traffic count is on I-35 just north of 51st street. 239k daily, but supposedly it reached 251k in 2005. Must have been measured on a friday.

[sprjus4]

Must have been measured on a friday.

AADT (Annual Average Daily Traffic) counts take traffic counts from every single day of the year, then use the average of all of them, hence "Annual Average" in the name. It's not one specific day.

For the particular example you gave, there are probably some days (Weekends, holidays, etc.) where the number exceeded 300,000 in one specific day. Then there's probably other days it's only 150,000 in one day. All of that is included in the AADT, just averaged out.

[Hot Rod Hootenanny]

For Franklin County * - I-270 between Oh 315 & US 23, 174,180 (2014 is the most recent traffic survey ODOT provides the public)
* - depending on how specific one wants to get with city boundaries. I'm not sure if that one mile of I-270 (between 315 & 23) is in Worthington or Columbus.

[vdeane]

Must have been measured on a friday.

AADT (Annual Average Daily Traffic) counts take traffic counts from every single day of the year, then use the average of all of them, hence "Annual Average" in the name. It's not one specific day.

For the particular example you gave, there are probably some days (Weekends, holidays, etc.) where the number exceeded 300,000 in one specific day. Then there's probably other days it's only 150,000 in one day. All of that is included in the AADT, just averaged out.

That's the textbook definition, but in the real world, it depends on how an agency computes it.  Realistically, you're not going to have data collectors operating 24/7/365 on most road segments, and even on those where you do, not all the data is going to be usable due to things like construction, equipment malfunctions, etc.  Most traffic counts for NYSDOT compute it from 48-72 hours worth of weekday data (Friday afternoons and all of Saturday and Sunday are excluded from calculations, though the data is sometimes used for things like setting up work zone traffic control).

[Rothman]

Heh.  Yeah, vdeane is right and even FHWA's docs go over the somewhat questionable extrapolations that are done in computing AADT.  Averages of averages of averages...

[ilpt4u]

No Interstate in Carbondale, IL...but per the IDOT Interactive AADT map, W Main St/IL 13, just west of the west side 1 Way Pairs Split/Unite, comes in at 28,000

If I can take the sum of the IL 13 One Way Pairs of Main St (IL 13 West) and Walnut St (IL 13 East), then I get a segment of E Main (18,800) and E Walnut (19,900), both near Wall St, that sums to 38,700

[jdbx]

In my town of Pleasant Hill that would be an AADT of about 280,000 on I-680 at Oak Park Blvd.  It's pretty ugly northbound between about 2:00 PM and 8:00 PM.  Southbound isn't quite as bad, but still nasty between 5:30 AM and about 10:00.   The congestion on I-680 between CA-24 and CA-242 is within the top 10 busiest areas in the Bay Area.

[pianocello]

In the Orlando area, it looks like the stretch of I-4 between Disney World and SR 528 (to the airport) is at 235K vehicles per day.

I bet traffic all along I-4 between Tampa and Orlando is crazy.

I think it is. One of the most frequently congested stretches of road in the area outside the city is I-4 between US 27 and SR 429, southwest of Disney World. The traffic counts there aren't as high as they are in the city, but there's enough vehicles trying to use the road and not a viable alternative that backups occur on a daily basis.