At a construction site in Alta, Michael, Franklin and Trevor meet Devin Weston and Molly Schultz. Devin wants them to steal two supercars, an Entity XF and a Cheetah, from two snobby rich kids. The cars will be sold
Race the cars
Franklin coerces the two car owners into a race down the Senora Freeway. Follow the cars, using Franklin's special ability as necessary to dodge traffic.
Tip! To drive in between the two trucks, as well as the two buses (a requirement for gold), activate Franklin's special ability before you approach.
Pull over and take the cars
As Franklin and the two racers reach Grapeseed, Franklin will call Michael. At this point, you'll be switched to Michael who is with Trevor on police motorbikes. Follow Trevor as he gives chase.
Trevor will diverge and drive on the other side of the freeway, through the tunnel, into the oncoming traffic. At this point, you can either stay in the right lane or follow Trevor into the oncoming traffic (the latter being a requirement for gold).
When you get into Paleto Bay, drive in the median to dodge most of the traffic. Soon enough, the cars will pull over on the highway bridge in Raton Canyon.