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From: Martin Brown <'''newspam'''@nonad.co.uk>
Newsgroups: sci.electronics.design
Subject: Re: Speed limiters
Date: Sun, 7 Jul 2024 10:56:34 +0100
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On 07/07/2024 10:03, Jeff Layman wrote:
> On 06/07/2024 22:53, Don Y wrote:
>> On 7/6/2024 5:23 AM, Martin Brown wrote:
> 
>> There has been talk of using cameras and license plate trackers to infer
>> the speed vehicles have traveled "across town" (i.e., at XX:XX:XX you
>> were seen at intersection X and are now at intersection Y at YY:YY:YY;
>> you could only have made that trip in that time interval if you exceeded
>> the average speed of...")
> 
> That has been very common here in the UK for several years, particularly 
> when there is a lot of construction and repair work for several miles on 
> motorways. There are "averaging" speed cameras at the start and end of 
> the roadworks, and at intervals too along the way (and always at 
> sliproads for those entering and leaving the motorway within the 
> roadworks). The first notice you get if you've been speeding is a letter 
> of intending prosecution which suddenly arrives several days after 
> you've driven along that stretch of road!

Specs average speed cameras are on quite a few of the UK's main 
motorways and especially on roadworks (of which there are quite a lot). 
They caught a lot of people out around Manchester and on the M62.

Guilty or not depended on how rich you were and the quality of the get 
you off a speeding charge lawyer you could employ. Footballers and 
celebrities usually got off. But for a while everybody did!

https://www.manchestereveningnews.co.uk/news/greater-manchester-news/m60-speed-camera-smart-motorway-8386970

Gatsos instant radar speed cameras used to be huge boxes on the gantries 
but are now streamlined yellow tubes on the edges of the lanes.

Investment in "smart motorways" which allows them to use all 4 lanes as 
live running lanes (3 properly designed to be running lanes and one hard 
shoulder intended as a refuge for broken down vehicles).

It didn't take account of dumb drivers or of the need to properly 
maintain the camera systems used to monitor the road situation. As a 
result they are having to add a lot of extra refuges to the "smart" 
motorways to make them safer after several very high profile nasty high 
speed collisions between motorway traffic and broken down vehicles.

The smart motorways I drive regularly I have such totally misleading and 
misguided signs that I no longer trust them to tell the truth. Worst 
example I saw was alternate gantries showing 40mph speed limit(as low as 
it actually goes on a motorway) and 60mph. I think the control room were 
messing about to see what traffic chaos they could cause.

Every other trip there is a claim of "animals on the road" but I have 
yet to see one.

-- 
Martin Brown