@Vicegrip 141567 wrote:
The only way to stop cars is to install hard barriers.
It probably goes without saying that I am opposed to this. As is FHWA (and vicegrip). They state that bollards or other barriers should only be used as a last resort, after all other efforts have been tried and failed. Not the default option to be used first, which is typical in most places. NVRPA removed all the bollards on the W&OD 20 years ago because they determined that the rare vehicle encroachment posed less danger than the 24/7 existence of dangerous/hard barriers. I agree with them.
Bigger, more noticeable signage would be a start. Although paint can be slippery, something like a No Cars symbol or the like (rather than paint on the entire surface) might be a reasonable compromise–accompanied with signage. There are also design changes and surface materials (not slippery ones) that can signal to drivers that they are not entering a road.
I truly think it would be worthwhile to talk to this motorist (we have the license plate) to find out what happened. Where did he/she enter? What was the confusion? Answers to those questions will help inform us how to reduce the risk. At this point I don’t see a need to give out a ticket (unless we learn that it was intentional trespassing I suppose).