streak, its front end rounded like a horseshoe crab, shot out of the tunnel under the building beside him and vanished along the road where he'd just been walking.

Now Dan saw a small modest sign beside the road.

Care High-Speed Vehicles Only —Swept—

Dan crossed the rail at the end of the street with great caution.

The Porcyn clothing he was wearing consisted of low leather boots, long green hose, leather shorts, a bright purple blouse and a sky-blue cape. Dan bunched the cape in his hand and thrust it ahead of him as he crossed the rail, for some races were finicky about their exits and entrances. The straight, sharp boundary between city and farmland, and the identical buildings, suggested to Dan that here was a race controlled by strict rules and forms, and he was making an obviously unauthorized entrance.

It was with relief that he stood on the opposite side, within the city. He glanced back at the sign and wondered what "Swept" meant. Then he gave his attention to the buildings ahead of him.

Low at first, the buildings rose regularly to a greater height, as far as the fog would let him see. Dan remembered the storm of the night before and wondered if the progressive heightening of the buildings was designed to break the force of the wind. The buildings themselves were massive, with few and narrow windows, and wide heavy doors opening on the street.

Dan walked farther into the city and found that the street took right-angle bends at regular intervals, probably also to break the wind. There was no one in sight, and no vehicles.

Dan decided he was probably in a warehouse district.

He paused to look at a partly erected new building, built on the pattern of the rest. Then he heard from up the street a grunting, straining sound interspersed with whistling puffs. There was a stamping noise, a thud and the clash of metal.

Dan ran as quietly as he could up the street, stopped, glanced around one of the right-angle bends. He was sure the sound had come from there.

The street was empty.

Dan walked closer and studied a large brass plate set in the base of a building. It looked about twenty inches high by thirty wide with a rough finish. In the center of the plate was a single word:

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