On Sat, Nov 29, 2008 at 8:31 PM, Erik Johansson <[EMAIL PROTECTED]> wrote:
> > Ok.. so do you use two via nodes to resolve the left/right turn issue > with out using lat/lon? > No. gosmore expects exactly one 'via' object and it must be a node. So complicated (multistate) restrictions aren't supported (yet) e.g. specifying no U-turn at traffic_signals where another road cross. At T junctions the ambiguity is resolved using restriction=no_left_turn/no_right_turn. Where slipways join bidirectional roads (at high speed), the ambiguity is resolved with restriction=no_u_turn (only_straight_on ). At 4 way junctions you should one of the ways (making 2 Ts). Some people want us to split ways whenever an ambiguity arises, but it will mean we have to split a number of major roads at every little intersection where a service road joins. So a better solution would be to resolve the ambiguities with tags like from/to_direction=forwards/backwards (unimplemented). Routing engines already need to know about forwards / backwards. And it will be a lot easier to write a user friendly visual editor for turn restrictions.
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