When the sea to sky highway was upgraded for the Olypmics the speed limit was increased to 90km/h. Many people would break the 90km/h speed limit. A few years ago a (junk) scientific study was made and the speed limit was lowered back down to 80km/h. What happened? People still drove the same speed as before.

When the government imposes laws that don't make sense people simply ignore them, speed limits are a perfect example of this. I feel in this case people will ignore these changes in 7b and can you blame them? Of course the consequences would be higher than just a speeding ticket if caught.