When running, especially barefoot, surface color, texture and thermal properties of the surfaces are crucial to consider. For example, a newly painted white line on asphalt will absorb about 80% less heat.
An outside temperature of 70F, a white line will get to about 85F and the blacktop to 170F from solar radiation. (Obviously the white line will absorb heat from the road as well.) On a 100 degree day this would be approximately 115F and 200F respectively. Head for the white lines like a hollywood movie producer!