Lots going on with regards to the "making arterials work better front" - alas, not very dramatic or, perhaps more aptly, not melodramatic enough for the local daily press.The entire City of Palo of Palo Alto traffic signal system (100 plus signals) is bieng upgraded, including new electronics, new controllers, new signal cabinets (in many locations), and fiber optic interconnections (in many locations). A more than $1m project mostly funded through competitively won federal and State transportation grants. This project will be completed by fall of this year. Benefits will include much more reliable traffic signal system operation, creating capability for City of Palo Alto traffic engineers to re-time signals from their offices as needed based on real-time traffic condtions, and provision of the basis for future enhancements, including full traffic signal automation (signal timing changes are made automatically and electronically, next cycle, based on real time traffic conditions)for which grant funding is now being sought. In addition, the City of Palo Alto Transportation Division has just won a regional (Metropolitan Transportation Commission) grant to re-time (which requires extensive data collection as a precondtion and preparation of whole new signal timing plans)all traffic signals on Middlefield, Embarcadero, El Camino Real (in conjunction with Caltrans), Oregon Expressway (in conjunction with Santa Clara County) and Page Mill Road (also in conjunction with Santa Clara County). Again, none of this is perhaps melodramatic enough for a local daily press headline, but all is strategically important for safe and efficient mobility in Palo Alto.
I'm glad to hear that the PA transportation types are worried
about this problem and it sure seems like there's a lot of
stuff going on. That said, I can't help but notice that
all the projects Joe is talking about seem to be centered
around control systems as opposed
to laying down new asphalt. I only have
a passing familiarity with traffic engineering for
roads (as opposed to for data networks) but I
do know that control systems
can sometimes dramatically improve throughput of roadways
that you'd think were totally congested. However, I
don't know if that's really the case in Palo Alto.
Maybe one of my readers would care to comment.
Posted by ekr at April 13, 2004 05:55 PM
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I have a friend who's a Seattle traffic engineer, and have talked to him about the more asphalt question.
He's researched it in depth, and I've just taken his word for this because it's his business to know and he was quoting studies at me like the data was real.
He says that more asphalt in general doesn't improve congestion on roads with lights. That the whole problem is stopping traffic in the first place, and that short of making roads limited access and having on-ramps, adding a lane or two or three doesn't really change the picture.
In his understanding of the data, traffic will shift to the arterials until they reach some threshold of annoying congestion. The only way to significantly improve throughput is to reduce the numbers of times an average car is stopped by a light.
The two ways to do this are better signal management, and switching to limited acces/on-ramp intersections.
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