Motornormativity. Not all of it, it’s a huge problem, but there are so many really small bits that could easily be addressed. Like get rid of slip lanes, and make corners into side streets sharp right angles. When you’ve got a bike path (yes, putting in the bike path at all is one of those big difficult problems, but when you’re getting that done anyway), making sure it has clear priority when it crosses side streets through the use of wombat crossings and road markings.

I dunno how to get it noticed. Half the problem is getting people to acknowledge it even is a problem when it’s directly pointed out to them. Half the people are so deep in carbrain they refuse to acknowledge there’s even a problem with everything being centred around cars. And most of the rest buy into the neoliberal “pErsOnAL reSpONsiBiliTy” nonsense and blame crashes (or “accidents”, as they invariably call them) entirely on the bad driving (or worse—victim blaming it on the cyclist or pedestrian), rather than being willing to acknowledge that bad driving is inevitable and designing so that (a) bad drivers have other viable alternatives to driving if they want, and (b) the infrastructure could be designed to be forgiving of bad driving and reduce the likelihood and severity of crashes.