I dont count Tshirts when I drive!
Ok, so this test is hard. But since when do I try to "count" points from people with different colour t-shirts! NEVER! Try this test without counting, i.e. if you were actually driving and monitoring people and not trying to count them, and its very easy.
This test is better at representing a situation where there's loads of adverts and signs everywhere along a road that distract you. Trying to concentrate on all those whilst paying attention to drivers and listening to someone is dangerous. I haven't seen anyone complain about too many road signs and adverts on our roads.
So this test is pointless.