What seemingly minor rules would you introduce that could make a bug difference?
I'd make it illegal to sell coats (for any age) that didn't have some kind of reflective strip somewhere on the back and on at least one sleeve. On these dark mornings and early evenings I've lost count of the number of pedestrians, dressed in black or other dark colours, ambling across the road (not at a crossing point), oblivious to the fact they are nearly invisible to oncoming traffic.
I think if this was a unilateral rule, clothes designers would rise to the challenge to make stylish coats with flashes of reflective stuff. It could quite cool.
So what would your minor rules be?