Google map route not found message

I am using Google Maps v3 API to calculate a route of 1 hour, I calculate route of 56 min finally when I am about to calculate route for remaining 4 min It doe开发者_如何学JAVAsn't find any route for 4 min from last calculated point in that area.

What could be a best solution to deal with this situation?

Maybe you hit the limit for way points. If I remember right, it's 8.

EDIT: If it's about the timeout, then do something like this:

/* Before questioning way points: */
$delay = 0; // ms
if {
    // do stuff
}
else
{
    $delay = 10000; // 10 sec.
}
/* After */
usleep( $delay );