I ran a test scenario (using chariots) to doublecheck, and wheeled units can move onto a roaded tile of otherwise impassable terrain only if they are moving along a road (that is, from one roaded tile onto another). If a wheeled unit starts on an unroaded tile or tries to land from the sea, a road on the tile the unit wants to move onto makes no difference. Just in case anyone isn't aware of it, the fact that a road is in another civ's territory does not keep wheeled units from using it to move through otherwise impassable terrain, although of course the road's movement bonus does not apply in the absence of a ROP agreement.
So with the Wheeled flag, artillery and radar artillery could move along roads to attack enemy territory regardless of the terrain, but could not participate in amphibious invasions of mountains, volcanoes, jungle, or marsh even if the tiles they want to land on are roaded. So we would get the effect we (presumably)want with respect to preventing players from landing artillery as part of amphibious operations.
So with the Wheeled flag, artillery and radar artillery could move along roads to attack enemy territory regardless of the terrain, but could not participate in amphibious invasions of mountains, volcanoes, jungle, or marsh even if the tiles they want to land on are roaded. So we would get the effect we (presumably)want with respect to preventing players from landing artillery as part of amphibious operations.
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