Private cars can only use one lane on one-way roads

[freddyhayward]

This change:

Code Select Expand

https://github.com/jamespetts/simutrans-extended/commit/f5c7d5c216f4d072bf947c98659344daf6fb0231 that seems to be a measure against 'car traps' has the side effect of halving the capacity of all one-way roads, regardless of whether or not they are dead ends.

[jamespetts]

This has now been fixed.