It will be a blessing when all cars have full LED lighting. The number I see with failed lights seems to be on the increase and often cars only a few years old. Brake lights especially given some drivers can't travel for more than a few hundred yards without dabbing them even on a straight traffic free road in some cases.
Automatic transmission and left foot braking with left foot resting permanently on the pedal?
More likely poor concentration or they've just received a text