No person shall park any vehicle on either side of any street approaching a railroad grade crossing within 50 feet of the closest rail; provided that, where existing permanent structures are located along the street and closer than 50 feet, parking may be permitted in front of the structures, unless otherwise prohibited, if the parking does not interfere with the view in either direction of an approaching locomotive or train.
(`90 Code, § 11-209) Penalty, see § 72.99