Yeah, I think I’ve seen a statistic that getting hit by a car going 30km/hr, you’re probably going to be fine. If you get hit by a car going 50km/hr, you are most likely going to die. I can’t think of any reason to allow cars to travel over 30km/hour in urbanized areas, outside of designated arterial roads.
Aggressively limit speed and enforce it until you're onto the fast roads.
If cars could only roll on at 10mph I'd feel a lot safer and I'd probably be able to use my bike and make better time for the local stuff.