It works reliably based on testong , in highway and freeway segments when the criteria are met.DwarfLord wrote:Very good reasons indeed, thanks for reposting them.
Over the last 6 months I have responded to I think around 4 or 5 URs complaining of being routed off freeways only to be routed back on again, and each time the straight-ahead restriction was green. In the beginning of that period, I was told that detour prevention isn't designed to work in certain circumstances involving I think change of freeway/highway type and perhaps other things. But perhaps the detour prevention algorithm is under continuing development...? Is it really safe to assume it works reliably?
If we start switching those straight-ahead restrictions to green, and the off-then-on freeway URs start coming back, it will be a tough sell not to put them red again...
The segment before the off ramp, and the segment after on ramp (the last and first segments of the highway on either side of the detour) must have IDENTICAL names. This means exact spelling including cardinals, spaces, etc., AND city names.
This can be achieved either with matching primary names, or matching alternate names. (It is currently unknown if a primary <==> alternate name match will be sufficient). Sometimes in order to accomplish this, you must add an otherwise wrong alternate name to both segments to create a match.
Anytime you allow one of those turns, you should at the same time ensure there are matching names to activate detour prevention.
Re: [Page Update] Junction Style Guide