[Suggestion] Upgraded highway tiles only give +1 adjacency bonus to adjacent non-highway tiles

HofNerd

Colony
Beta Tester
Extremely Helpful Person
With highways in their current form all adjacent tiles get full adjacency bonus from them, this allows highway tiles to be used as 'filler' to make a nursery fully upgradable:
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This also removes the necessity to build chambers:

I think giving highways the same adjacency bonus as a wall makes building in chambers a necessity if the player wants to fully upgrade their tiles.
 
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