I've noticed this several times in the past. After working your way through a traffic jam you get to an variable message sign with a message on it. Right after you get past the sign the traffic jam ends and you can get back to highway speeds. Do you really have to slow down that much to read a traffic sign? I wonder if Mn/DOT has the data to figure out how many traffic jams are caused by messages flashed on the variable message signs.
Monday, 11 April, 2005
Electronic Traffic Signs Cause Jams