An issue has come up a few times now which has really bugged me. Whenever a road has on-street parking, it appears that cars parked on the street are within the departure sight distance triangles (per AASHTO). For example, on a project that I'm working on with a 40 mph design speed, if you plot the departure sight distance triangles at a typical intersection, you would need to restrict parking for about 300' from the intersection which would be most of the block. Currently, cars are allowed to park up to about 20' from the intersection. I've research this a lot and the only thing I've found is to allow a certain distance from the crosswalk (20'-100', depending on the design speed), but this if really for the pedestrians to see approaching cars before they cross and not for the vehicles on the minor street. Is this something that is just an acceptable risk since on-street parking can be very desirable or is there something I'm missing? Any thoughts would be appreciated.
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