Shortcut on Lagoon raceway
If you have a very fast engine you'll love this shortcut.
First off on Lagoon raceway you will come across three waterfalls.
Further on go across the wooden plank and ram at the waterfall, and you will find a hidden tunnel not located on the map.
Drive strait through the tunnel, I think the rest will explain itself.
If you need more help, we've got more Road Trip cheats and also check out all of the answers for this game
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