light-fast

He harnessed four horses, who could quickly traverse the plain, and entered his light fast carriage.

It was growing light fast now, and they strained their eyes for a sail.

Their light fast mobile units scoot right on past the heavily fortified centers and capture small positions in the rear.

"It is getting light fast," Dick said, as he wiped the perspiration from his face.

It was growing light fast, and it was time they were on their way.