Look at 
www.marsrutai.info/directions.htm#-24.86775,113.66916,-31.87809,115.83885,-27.44842,153.01783

It iterates through all segments of route and still works much faster
than your solution. Also fast in IE7. The finding of closest point is
in function getProximity(mouseLatLng)

The approach was to convert and store polyline vertices coordinates in
pixels after each zoomend event. Then calculating closest point is
simple and fast math operations, even every route segment is visited.

Evaldas


On Jun 26, 12:33 pm, epicycler <[email protected]> wrote:
> demo at
>
> http://www.epicycles.com/demo/simple.php
>
> best in FF, IE6/7 slow, IE8 workable, untested elsewhere

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