It is about a Gran Prix driver participating in a rally.
"On the 40th, in Loch Achray, he crashed, inflicting severe damage on the Lotus Cortina. He then rolled into a ditch on the 45th, Glengap. «We tripped over the Border», he said, and so they had."
I really can't understand why the author uses the capital letter to write "the border"? Does he mean anything but the edge of the road?
The only thing I can think of is the Borders, a region near the Scotland border. It is where the driver was from. But it still doesn't make any sense to me.
Thanks a lot!