Skip anchors this close to a junction, metres.
Extra offset outwards, metres.
'kerb': on the sidewalk near the kerb (or the verge on rural roads); 'edge': at the outer edge.
Which sides: both, or alternate sides (power lines usually run on one side).
Distance between anchors along a road, metres.
Only these surfaces (empty = all).
Only these classes (empty = all).
Options for roadAnchors.