[Tagging] traffic lights

Martin Koppenhoefer dieterdreist at gmail.com
Tue Sep 6 14:07:49 BST 2011

2011/9/6 John F. Eldredge <john at jfeldredge.com>:
> If the traffic signals in Europe are directly above where you are
> supposed to stop, rather than ahead of that point, then how do you tell when it is OK to resume moving?

First of all it is not everywhere the same in Europe, it really
depends on the country, and sometimes also on the city. Usually (at
least in Germany and Italy) there is (should be according to the law)
a white line before the actual lights which indicates where to stop
(quite similar to the line for stop signs). In the Rome area (due to
generally overcrowded roads and flexible interpretation of traffic
rules) there is often 2 synchronized lights for the same crossing: one
shortly after the white stop line (i.e. before the pedestrian
crossing) and another one after the crossing, so that people who
didn't stop at the line but after (sometimes even after the pedestrian
crossing) still can see when the lights turn green.

Another aspect that should be taken into account when inventing the
model for actual traffic light positions:
There is sometimes indipendent traffic lights for different directions
on the same lane. E.g. a lane where you can turn left or go straight
might have 2 traffic lights, where you could have states like: green
for left turn, red for straight on.


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