These freeway lane markings do seem a bit unusual

Q. Honk: The lane lines on the I-10 Freeway in Santa Monica and maybe elsewhere are white on a black background. Both the background and the broken white lines are sprayed on. Why are they like this? I thought it might be to help driverless cars.
– Bob Marsh, Pacific Palisades
A. That stretch there is concrete, not the more attractive asphalt, as you know, Bob.
The technique you mentioned is to help motorists figure out exactly where they should be: White paint on concrete could use a litt