This is a fine time to introduce a tiny 4.0 request...
It would be cool to have the "boost" and "charge-up" toys from the Speedway as Collectibles in the Toy Box (I'd wondered why the Cars' gas can didn't make it in 1.0). But even if they don't make it, if there could be a "Vehicle Booster" Creativi-Toy that could affect Triggering Player/All, then you could have any Collectible cause an up-tick in the player's vehicle boost meter, or alternatively cause that vehicle to immediately "go turbo". Any trigger could do this (Trigger Area or Trigger as other examples), but it would work well with ANY Collectible with the tried-and-true Collectible Tracker. If the player doesn't happen to be in a riding vehicle at the time, it would just be a no-op.
Perhaps the "Vehicle Booster" could even be a "Vehicle Enforcer" (like the Action Enforcer for characters), where in addition to actions of boost & immediate-turbo, you could toggle the monster tires or cause the vehicle to spin out from an explosion
.