Prediction: I-270 Bears the Brunt of the Highway 40 Construction (Updated)

With the January 2nd shutdown of Highway 40/I-64 just two months away, the conventional wisdom is that the major traffic headaches will be seen on roads that parallel the closed portion of the highway. Clayton, Ladue, Manchester, and Olive will surely see substantial increases in traffic. As will I-44 and I-70, though those interstates will be able to absorb the traffic due to the added lanes on those roads (see recent article on the safety of that move). Yet, I don’t think it’s any of these roads that will bear the worst part of the traffic congestion after the shutdown. Rather, it will be I-270 that gets hit with the crawling traffic on a day-to-day basis.

First, we need to realize that I-270 is already running near capacity during most rush hours. Next, imagine the fire hose of traffic that’s eastbound on Highway 40 any morning. It will be forced to divert north or south on I-270, as shown on the map below. Chances are that most of drivers will choose the southbound route, since I-44 exits are closer to their Highway 40 counterparts than I-70. The result? Delays and jams on I-270, particularly between Highway 40 and I-44.


[Zoom and pan the map as needed; Click on markers/routes for more information; full map]

It won’t be just I-270 that gets the diverted traffic. Many of the north-south arteries in West County, such as 141 and Lindbergh, will struggle under the load of drivers finding new routes to their destinations.

It seems that some of the county’s traffic experts are worried as well. Garry Earls, director of the County’s Department of Highways and Traffic, had the following to say at a recent meeting of the I-64 Connection Subcommittee:

Garry Earls strongly recommended that state transportation officials do everything within their power to encourage east-bound I-64 motorists to take north-bound I-270 – once the interstate closures begin early next year. Earls is concerned that too many I-64/40 drivers will try to circumvent the closure by taking I-270 south to I-44, and thence to Elm Avenue. “The overwhelming majority of east-bound I-64 traffic is headed for Clayton, and I-44 won’t be able to handle them,” Earls predicted. “We have to figure out how to get those cars to the north – not the south, because we don’t have a place to put them. We have a place to park them, and that place is Webster Groves.

Earls continued to say that these motorists – rather than using I-44 to access the central corridor – must be given every incentive to take I-270 north from I-64 to reach Olive and Page.

MoDOT’s Ron Morris responded that the state can’t force motorists to take I-270 north from I-64, but that he would consult with other MoDOT traffic engineers about the possibility of providing an additional exit lane onto northbound I-270 for I-64 drivers to
use.

[source]

What are your thoughts? Where will the worst jams be in January of 2008? Leave a comment by clicking on the link below.

UPDATE 11/4/07:

It seems Fox 2 liked this posting. Friday they had an interview with Gerry Earls and showed a map very similar to the one above (down to the color of the routes). Glad someone’s reading!

This entry was posted on Tuesday, October 30th, 2007 at 11:28 pm and is filed under Alternate Routes, I-270, I-44, I-70, Predictions. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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