I don't think that's it, on a residential streets there's an awful lot of dots yet nowhere one can possible enter or exit mid block. On the freeways It's evenly spaced but not a on of off ramp. Residential areas spaced like
. . . .... .. .. .... .. ...... . . ... . and freeways like . . . . . . with about a 1/2 inch between ea dot.
Small white dots with red pinpointed centers located right on the line indicating indicating a roadway.