When you lower them too much, you increase the disparity between those who obey the speed limits and those who don’t give a sh!t. The former end up getting run over by the latter.
Makes sense. Good point.
There’s a section of road I drive during my commute that absolutely nobody obeys the limit. No car, truck, bus, ambulance, motorcycle, is travelling at 18 MPH (30 kph) for the 3/4 mile strip.
Okay, that’s an exaggeration. New drivers and people with radar detectors that notice there’s a speed trap there are doing the speed limit.
The city went so far as to install one of those speed boards that flash if you are travelling more than 10 kph (6 MPH) above the posted limit. Every single vehicle going through there gets the flashing lights and frowny face. Every. Single. Vehicle.