I am arranging 16 beehives permanently on a truck flatbed (8'X12'). Two rows of eight hives face each other towards the center, seperated by a 45" wide walkway down the middle. Hives are on two hive pallets, all spaced seperated by 5/8", with a seperator board between each hives. Hives are painted one of four different colors, yellow, brown, grey or green. The hives will have a number (1 - 16)on their front, so that is another way the bees can find their own hives.

As I am not sure that bees can read address numbers, and easily differentiate colors, I am seeking ideas on what to mark on the walkway to furthur help the bees find their own hive and minimize drifting. The walkway is coverd with three pieces of plywood. Some ideas that I have had are:
each piece of plywood a different color,
different color gyometric shapes on the walkway,
some kind of runway lines like as on the Nazca Plain.

Any other suggestions ?