[dylan604]

I thought the whole point was to reward/encourage drivers for driving the limit, not speeding. This seems very odd

[JohnFen]

I've seen this a number of times. One time, I got a clue as to how it comes about -- I travelled a 35MPH road with synchronized signals, and the city reduced the speed limit to 30, but didn't go to the trouble to adjust the light timing to match.

[nomel]

Yes. It directly conflicts with the large signs they have posted, touting the benefits of going the speed limit.