I have some ideas for roads and new types of roads
Two-lane divided road: Just a two-lane road with a the middle part like in four, six and eight-lane divided roads. Middle tram track upgrade could be only one way and would remove the middle part.
Smaller pedestrian street:1 tile wide pedestrian street.
Unpaved/gravel pedestrian paths: Small pedestrian paths like we already have but with a gravel or dirt texture.
Six and five-lane two way highways: Six-lane two way and five-lane two way asymetric highways for building better smaller urban highways.
this is all for now, might add some later