Awesome

Roadcreator

A free road creation tool for unity.

Place, move and delete points to create a series of curves
Generate roads with different width, texture and much more
Customizable shoulders(extra meshes), possible to have multiple on each side
Options are changed per-segment which allows for more control like the road having a extra lane before a intersection
Terrain deformation to make the terrain adjust to the road
Offset one side of the road in the y axis to create curved roads which is useful for racing track corners
Easly make a road into a bridge with automatic pillar placement (see bridge section)

Includes a prefab line tool to place prefabs along a series of curves
Many customization options including: changing rotation direction, scale (per-axis) and adapt to terrain
Option to have a different start/end prefab which is useful for example guard rails
Options to curve the mesh and also to fill in the gap between them to get a smoothly curved and connected line of prefabs

Generate bridges with only a few click!.
Currently 12 are included but you can easly add your own. The tool will modify the bridge mesh so that it fits the road mesh perfectly, it also matches the extra meshes
Generate pillars automaticly with options such as: gap, scale and rotation direction
Adapt to custom bridge option to automatically align the pillars with the custom bridge mesh

Procedurally generated intersections, easly create them by connecting two roads end/start points
Easly customize intersections by moving points and changing how sharp the connections should be (per connection), also an option to generate smooth curves automatically
Move the connected road points when the intersection is selected to have full control over the intersection mesh
Customizable shoulders(extra meshes), possible to have multiple on each side
Easly generate nice looking turn markings automaticlly by changing few options
Main roads feature which makes it so that it looks like the road continues through the intersection
Bridge support including pillar placement
Procedural roundabouts with changable radius etc. Has the same smooth connections and customizability as normal intersections, including extra mesh and bridge support