Everything you need to know about the ACS Vehicle Operating System by here:
Videos for ACS here: https://www.youtube.com/channel/UCeFe8wDJ06lIsoNWICSiOiw
Keep in mind, the newest video here is 6 years old.
You can purchase ACS on the MP or in world:
VOS 1.3 Beta Version 1.3 for land vehicles.
Angie is retiring but still around to help.
ELR helps build communities of builders and modders in SL's car culture with a tested platform of 'simulator-realism' vehicles, styled on Drift and Track Racing capabilities for consistent, addictive precision action.
Vehicle Tutorial http://wiki.secondlife.com/wiki/Linden_Vehicle_Tutorial
RCX Productions Wordpress Page