I used that wiki actually...it says by default and doesn't mention cars at all. Help me edit better :) Why is it bad to say no to cars vs. unknown?  No mention of that tag., "By default access=no, foot=yes, bicycle=yes and similar like mofa=yes and moped=yes are implied. If something usually not blocked by bollards (cyclist, horse, etc) would be blocked then tag this explicitly. It is also useful to specify maxwidth:physical=* so that it is easier to determine who can pass the location (pram, bicycle with trailer, etc.). Always place a bollard node before a junction node unless it affects all traffic across the junction in all directions."