E-Z Pass and basic math used to catch speeders?
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When my home state of Illinois originally rolled out its electronic tolling program, I-PASS (Illinois' version of E-Z pass, the national standard) the toll authority said that the transponders in the vehicles would never be used to track your location, only to collect tolls as you pass through the tolling gateways. This being state government, no-one believed them, and it appears that that day is upon us. During the last year or so, Illinois has virtually forced its residents to purchase the electronic tolling transponders by doubling the tolls for users paying with cash. For me, that would mean going from $0.40×4 tolls ($1.60 for about a 20-mile commute) to $0.80×4 tolls ($3.20 per day, $16/week, $64/month, $768/year). I can't afford to pay the extra $384 per year, so I had to purchase the $15 transponder, along with just about every other commuter in Chicago. Once everyone had the I-PASS transponder, all toll plazas in the Chicago area went under construction to have "open-road tolling". This basically means that you don't have to slow down to pay your toll, they get your transponder number as you go underneath the sensor array.
Case in point, there is a toll booth for motorists entering or exiting I-355 to/from I-55. Here is a satellite map of this toll plaza. You can plainly see the open-road tolling lanes on the inside, and the toll booths on the outside, both for motorists without I-PASS, and people with trailers, etc. that have special tolls they need to pay.
9 blocks north of this toll plaza is the 75th street overpass, about a half mile away. What you can't see on the satellite map is that there are a second set of sensors hidden between the girders underneath this bridge. I wouldn't have noticed them, if it weren't for the spotlights that enable a set of cameras to record the rear license plate of cars as they go through.
It does seem a bit odd when you approach the bridge at night. Most bridges are lit from a few fluorescent rods at night, while this one is incredibly bright. It isn't until you pass under the bridge that you notice that all of the lights are facing with traffic, pointing at the back of the cars as they go through the overpass. It's blatantly obvious coming the other way, as the lights are shining towards you. There are no lights or sensors on the southbound side.
In the old days, the older I-PASS transponders used to beep when they were read. I think this caught the Illinois DOT by surprise, because some people still have them, and her is now a sign next to the highway, reading "I-PASS Users: ignore beep, you were not charged."
So what purpose, exactly, would an installation like this serve, if not to catch speeders? Can we expect this on every overpass? Setting up a system like this only seems to serve two purposes, as I can see…
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