Question 607338
There is no way you are going to maintain that speed for so long. Traffic jams will slow you down. You will run out of gas long before that however.
as far as turning around you won't make it at your speed. 
You saw a spike three miles away! I don't think so. You are lucky to spot one 30 ft away.
You won't get across the border either. Have you tried to cross the border since 9/11?