Martin turned control over to the younger trooper and relaxed in his seat to go over the APB from Washington. Car 56 bored steadily through the night. The thruway climbed easily up the slight grade cut through the hills north of Wheeling, West Virginia, and once more snow began falling. Clay reached over and flipped on the video scanners. Four small screens, one for each of the westbound lanes, glowed with a soft red light. The monitors were synchronized with the radiometer and changed view at every ten-mile marker. Viewing cameras mounted on towers between each lane, lined the thruway, aimed eastward at the on-coming traffic back to the next bank of cameras ten miles away. Infra-red circuits took over from standard scan at dark. A selector system in the cars gave the troopers the option of viewing either the block they were currently patrolling; the one ahead of the next ten-mile block; or, the one they had just passed. As a rule, the selection was based on the speed of the car. Beamed signals from each block automatically switched the view as the patrol car went past the towers. Clay put the slower lane screens on the block they were in, turned the blue and yellow lanes to the block ahead. They rolled past the interchange with NAT 114-South out of Cleveland and the traffic densities picked up in all lanes as many of the southbound vehicles turned west on to NAT 26. The screens flicked and Clay came alert. Some fifteen miles ahead in the one-hundred-fifty-to-two-hundred-mile an hour blue lane, a glowing dot remained motionless in the middle of the lane and the other racing lights of the blue lane traffic were sheering around it like a racing river current parting around a boulder. "Trouble," he said to Martin, as he shoved forward on the throttle. A stalled car in the middle of the high-speed lane was an invitation to disaster. The bull horn blared as Beulah leaped past the two hundred mile an hour mark and safety cocoons slid into place. Aft in the dispensary, Kelly was sealed into her bunk by a cocoon rolling out of the wall and encasing the hospital bed. Car 5 slanted across the police lane with red lights flashing and edged into the traffic flow in the blue lane. The great, red winking lights and the emergency radio siren signal began clearing a path for the troopers. Vehicles began edging to both sides of the lane to shift to crossovers to the yellow or green lanes. Clay aimed Beulah at the motionless dot on the screen and eased back from the four-mile-a-minute speed. The patrol car slowed and the headlight picked up the stalled vehicle a mile ahead. The cocoons opened and Ben slipped on his work helmet and dropped down the steps to the side hatch. Clay brought Beulah to a halt a dozen yards directly to the rear of the stalled car, the great bulk of the patrol vehicle with its warning lights serving as a shield against any possible fuzzy-headed speeders that might not be observing the road.