I believe yellow is the easiest seen colour for the human eye.
"Yellow. You'll never miss it!" said the salesman when our family got the yellow Nissan Bluebird back in the early 1980s.
It got rear-ended twice, once on a hill by a car (I think it was a Range Rover) whose brakes had failed.
After it had been traded in for a Nissan Stanza, it got bumped in the dealership compound.
The salesman should have said, "Yellow. They'll always hit it."