LaneMarkingAttribute.DirectionCategoryMarker
Direction Category refers to the arrow direction shown on a sign or to road markings for a specific lane. Sign-posted markings are signs showing an overview of the direction markers for each lane. See the following figure for an example. 
Enumeration Details
- 0 :
DIRECTION_CATEGORY_MARKER_UNKNOWN - 1 :
STRAIGHT - 2 :
SLIGHT_RIGHT - 3 :
RIGHT - 4 :
HARD_RIGHT - 5 :
UTURN_LEFT - 6 :
HARD_LEFT - 7 :
LEFT - 8 :
SLIGHT_LEFT - 9 :
MERGE_RIGHT - 10 :
MERGE_LEFT - 11 :
MERGE_LANES - 12 :
UTURN_RIGHT - 13 :
SECOND_RIGHT - 14 :
SECOND_LEFT
