===How to map HOV lane segments===
There are four types of HOV lanes
#Whole road is HOV and there is no parallel path for non-HOV drivers
#HOV lane that is part of the road and can be accessed or exited at any time (dashed line separation)
#HOV lane that is part of the road but can only be accessed or exited at certain places (solid or double solid line)
#HOV lane that is physically separated from the rest of the road by a wall, cement barrier, flexible barrier, or land (separate parallel segment); only accessed from ramp segments other than initial entrance or final exit.
====Whole road HOV====