I travel in the HOV lane almost exclusively, and it's usually moving at a much different speed than the other lanes, as well, any obstructions are on the left side, so when I'm adding a report, I often have to type in LEFT or HOV in comments.

It would be really nice to select that you are an HOV lane user (if an HOV lane is available) and get the traffic updates for the HOV lane (estimated time of arrival mostly) instead of the usual one.