| The SINGLE WHITE line can indicate a few different things -- a separation of two adjacent lanes, the right side of the roadway, and to direct traffic (ie, exits where the white lines vere off, etc). This is why having a single solid white line can be confusing. just4kinks (See above) suggested this white line might indicate the RIGHT SIDE of a SEPARATE roadway, one of the few reasons for a solid white listed above. A friend of mine then called CHP and asked, and they answered that indeed the single white line indicates a SEPARATION of roadway. The double double yellows are for the drivers on the right, indicating the LEFT SIDE of the roadway, and the single white is for the driver in the HOV lane. So, it's not the double double yellows that "prevent" exiting the HOV, it's the single white being the RIGHT SIDE of the separate roadway (instead of a line indicating a lane separation). Interesting. Here is the answer from a CHP officer -- but note, this may all change if SO CAL decides to implement the lanes like they do in NO CAL. "The solid white line designates the HOV lane as a separate traffic-way (separate road). While this line is there, there is no connection to the normal lanes of traffic. If expense weren't an issue, CHP would put a wall in between the double-yellow lines (like the island you stated previously). By law, the double yellow lines cannot be crossed. Period. The only time you can enter or exit a HOV lane is when there is a dashed
line." -Dave
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