Sleeping Guard On a Bridge

If you had to cross a bridge that took 10mins to get across from one end to the other(driving / walking /whatever) A guard sits in the middle of the bridge asleep, but wakes every 6 mins.
If he see's anyone on the bridge, he'll send them back from where they are coming from.

How do you cross the bridge?
Submitted  4/23/2000 11:44:10 AM
Hint   Answer