Directions Renderer http://jsfiddle.net/gHK7s/2/
An implementation using route boxer
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http://cookieshq.co.uk/posts/search-places-along-a-route-with-google-maps-and-routboxer/
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http://jsfiddle.net/ftgr8dyp/ Another Example
THE ACTUAL GITHUB REPO https://github.com/denissellu/routeboxer