It is, but when you combine this along with red light cameras, they're looking to make money hand over fist.

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Well, when people only slow down when a cop is in plain sight and speed up once they're not then they have to resort to trickery.

And if you're breaking the law you should have to pay for it.

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Oh, don't get me started on the red light cameras. What about the attorney that went on the news telling people not to pay them.

Speeders are the least of my worries. I'd like to see the cops around here enfore the unsafe or unstable load law. I see to many folks hauling furniture and other items that are falling off their vehicles. IMO, that's way more dangerous than someone doing 75 in a 60.

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Here's my thinking, at least based on Chicago traffic:

In my experience, the amount of traffic always seems to set the speed limits itself. When it's congested, you can't drive more than 40 MPH anyway. When it's not congested, you can go 65 or more.

When it's congested, speeding isn't the problem, it's the reckless lane changing, which speed limits aren't going to control anyway.

Why not just leave the same old speed limit signs up that say 60/65 (which is what these digital ones would say anyway when it's free and clear) and when people have the ability to go significantly faster than that because it is free and clear, you give them the ticket?

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yes, this is horrible, this idea

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I believe the theory is this:

Say there's an accident on SB 270 at Manchester. Instead of everybody rushing at 70 MPH to the accident scene, then bunching up all at once, you slow everybody down to 40 MPH from Olive south to the accident scene, thereby easing the rate of cars flowing to the scene. There's less of a bunch at the accident, therefore less of a jam, and everyone gets through to Dougherty Ferry more quickly than before.

No idea whether this is how it will work in real life, but that's the thought anyway.

-RBB

That's a good point. I can see that being a benefit. I wasn't thinking about that specific case - more the general everyday use and congestion based on number of cars, not accidents.

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Don't they already use the bulletin boards to announce accidents already ahead?

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Consider traffic court -- how will the state prove what the posted speed limit was? What about when it's 60 at 5:50pm, then 50 at 5:51 pm? Ladies and Germs, it's a new speed trap!

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and travel times as well.

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Probably. However, not many people decide to take alternate routes. The dynamic speed limit will also attempt to slow vehicles down so emergency/construction crews can work safer.

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Check out the Legal Research Digest report I linked to above - that's a legit point:

http://onlinepubs.trb.org/onlinepubs...hrp_lrd_47.pdf

Basically, MoDOT will need to warn of a speed change ahead of time. Police who issue tickets will need to record the time and location the infraction occurred, and MoDOT should have a record in their control center of what the speed limit along that stretch at that particular time.

It will make successful prosecution of speeding tickets more difficult, but not impossible.

-RBB

That seems like it will be a lot of extra legwork for the officers to do if somebody wants to challenge it in court.

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Good point. If I'm a citizen of one of these communties, I'd rather have my cops patrolling the neighborhoods for suspicious behavior than spending time on speeders in the interstate.

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The police should already write down the time and location of the infraction on the ticket.

The rest of the legwork would be done by the DA's office as part of their pre-trial investigation.

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Yeah I know that they put the day and time, it was the communications between the MODot people and the officers that I was refering to. I am sure that MODot would need to have somebody dedicated to verifying what the speeds were when tickets were issued.

Overall it to me it seems like lots of extra work for just a speeding ticket by all the people involved.

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Eh, they can just post a logs of speed changes and either FTP/e-mail the report to police departments or make it available and pw protected on their own site - shouldn't be a big deal to generate.

-RBB