It absolutely is reasonable to expect people to drive below the limit. Speed limits are just that, maximum upper bounds of how fast you legally can go, not "recommended" speeds or minimum speeds, nor are they necessarily "safe" speeds. It's just a legal upper bounds.
It is a drivers responsibility to drive for the conditions. If conditions are calling for driving 40% slower, then that's what you do and suck it up.
If too many roads have conditions that require that, take that up with your municipality to fix the situation. Or, even better, advocate for better public transit and trains, and designing cities to move people, not move cars.
Maybe not, but if parking is so dense as to cause safety issues, and cause conditions to require slower driving, the city should still be addressing it.
I know, it's not reality in most cases, but it goes to show how poor our infrastructure is and underinvested in.
It is a drivers responsibility to drive for the conditions. If conditions are calling for driving 40% slower, then that's what you do and suck it up.
If too many roads have conditions that require that, take that up with your municipality to fix the situation. Or, even better, advocate for better public transit and trains, and designing cities to move people, not move cars.