I am trying to develop a map application to record driving directions
which involve multi-lane roads as places where the user clicks for
path markers.

If user clicks on wrong lane the path will begin with a loop involving
a u turn before completing the path correctly.

The same can be true where the end marker is concerned (the path will
involve a loop and a u-turn before returning to the spot on the road
wanted).

I'm sure this issue has arisen for many route direction applications.
Can anyone point me to a place where I can research how to deal with
the problem.

Thanks

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