The Williams driver Nico Rosberg says twilight racing is too dangerous and there is a risk that Sunday's Malaysian Grand Prix may have to be stopped for safety reasons.
The first two races of the Formula One season in Australia and Malaysia are starting later than this year, at 5pm local time, to catch a bigger television audience in the European morning hours.
Drivers complained about the light conditions as the sun set in Melbourne last weekend and Malaysia could have the added complication of tropical downpours in the late afternoon.
Rosberg starting a hour earlier wopuld be a huge help as visibility at twilight is so difficult.
He says he couldn't the edges of the track in some corners in Melbourne and driving into the sun isn't what racing's about.
