Are Speed Reader Displays Effective?
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Dynamic speed display signs are popping up beside B.C.'s Highways. They display the speed of passing vehicles above a sign showing the posted speed limit. Are these signs useful in persuading drivers to keep to the limit and if so, how effective are they?

In this case Allen Lukas appeals his conviction for speeding based on the visual observation of his vehicle's speed made by Cst. Neid of the Kelowna R.C.M.P. Detachment.
Stay in Mantrol is an anti-speed campaign from the New Zealand Transport Agency. The following quote from their web site summarizes the campaign:
I would have thought that being faced with a fine of either $368 or $483 and 3 penalty points would make any driver hesitate to exceed the speed limit by more than 40 or more than 60 km/h. Even so, 10,790 drivers were fined for excessive speed in 2024. Worse still, I know that this is only the start of the problem as these were just the drivers that were caught and issued the appropriate fine by police.
Question: I am interested in speed measurement because I was recently issued a speeding ticket with a fine amount of $138. I was driving westward on the left lane behind a pickup truck. I was looking for a street sign, so I slowed down and changed lanes to the right so that vehicles behind me could pass.