Reward Vehicles for Exploration

Current rewards for exploration aren't sufficiently exciting. They often come too early (contracts and mines you don't need yet, or servers you don't use yet), or too late (e.g population rewards when the settlement is already large), and it's also very incremental.
As an easy solution, I would suggest rewarding some explored sites with a few fully functional vehicles, preferably from tiers the player hasn't reached yet. It would serve both as a useful reward to encourage exploration, as a way to spike interest in future technologies, and as a way to allow early experimentation with technologies that would otherwise require investment, while not replacing the need to eventually create these vehicles on your own.