I'm sure there are groups for this, but I haven't seen any. But I know it would be nice to have diagonal or curved sloped avenues, roads and one-way roads, with intersections too (maybe even RHW or NWM).
(https://www.sc4devotion.com/forums/proxy.php?request=http%3A%2F%2Fwww.fhwa.dot.gov%2Fpublications%2Fpublicroads%2F06jan%2Fimages%2Fcap4.jpg&hash=16537bf25d84c8a045c55ae9d27bcb2417bb2dcf)
(https://www.sc4devotion.com/forums/proxy.php?request=http%3A%2F%2Fwww.aslacolorado.org%2Fwp-content%2Fthemes%2Faslaco%2Fimages%2Fawards_lightbox%2Fover500%2Flouisiana%2FStationPlaza1.jpg&hash=917a0618fc3daf73ccf41085a959deb91af6e061)
Google maps image below.
http://maps.google.com/maps?hl=en&q=I-25&ie=UTF8&sll=39.693537,-104.978426&sspn=0.003343,0.004823&rq=1&ev=zi&split=1&t=k&radius=0.15&hq=I-25&hnear=&ll=39.693232,-104.977809&spn=0.003344,0.004823&z=18 (http://maps.google.com/maps?hl=en&q=I-25&ie=UTF8&sll=39.693537,-104.978426&sspn=0.003343,0.004823&rq=1&ev=zi&split=1&t=k&radius=0.15&hq=I-25&hnear=&ll=39.693232,-104.977809&spn=0.003344,0.004823&z=18)