[GRASSLIST:1296] Bridge problem in 2D topological network

[nicholas.g.lawrence at mainroads.qld.gov.au]

I was thinking about the difficulty in representing a bridge
in a 2D topological road network.

Could a "turns" attribute be the solution? This attribute would
indicate which turns are legal at each intersection. A bridge
would then be a standard + intersection, with each road
being restricted in it's "turns" to only the road directly
ahead.

nick



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