This command is used to adjust the width of the virtual road in order to get rid of the invisible walls restraining the car's movements on either side of the road (the track polygons also need to be made passable using the Polygon Flags command). When you use this command, this dialog appears:
Change Virtual Road Width
If enabled, it will adjust the road width with the selected method below
Old Denis' Method: method used in old T3ed versions, will set VRoad width bound by polygons flagged as "non-passable (outer)"
Wall collision detection: uses wall collision polygon flags to set VRoad width
No left/right neighbor: for NFSHS tracks only; will use "no neighbor" polygon flags to set VRoad width.
Set manual: sets VRoad width based on left/right unit values you provide.
Set number of lane polygons (left/right)
If enabled, it will set lane polygons (shown as light green if Bitmap VRoad mode is enabled) from the VRoad center based on the values you provide.
Automatic lane detection
If enabled, T3ed will attempt to detect lanes automatically. It also has two toggeable options:
Find (non-)passable virtual road lanes
Calculate number of virtual road lanes from passable polygons.
Start & End Blocks
Determines the range of blocks in which the command will be applied. Default is 0 (first block) for Start Block and total block amount (as seen in File menu > Properties) - 1 (last block) for End Block.
