Update: Add concrete roads.
If you think the advanced road is too difficult and cockamamie, just try this one. Easily to build the similar curved roads like advanced road. Moreover, the plugin's roads have rotation awareness. You could also use it as base roads for advanced road.
The plugin is the asphalt road version of yukyuu'd railway package, so there may a lots of parts is similar or same.
Thanks for your download.
Update & fix: fix the dislocation for guardrails.
Thanks for @饼子one improve guardrails graphics.