Signals, Signs and Pavement Markings · Pavement Markings
It is allowed to turn left across a single set of double yellow lines to:

It is allowed to turn left across a single set of double yellow lines to:
enter or exit driveway
make a U-turn
drive into or out of a private road
Two sets of solid double yellow lines spaced 2 feet or more apart are considered a barrier. Never drive on or over this barrier, except at designated openings (see diagram).
Two solid white lines indicate a lane barrier between a regular use and a preferential use lane, such as HOV. You should not change lanes until a single broken white line appears.
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