The earth flowed around him like a warm, alluvial river. Halfway up the embankment Maitland found himself sinking to his knees in the sliding slope. An unpacked topsoil intended only to carry the grass cover, the earth had not yet been consolidated by the seedlings sprouting through its open surface. Maitland laboured away, searching for a firm foothold and using the briefcase as a paddle. The effort of climbing the embankment had almost exhausted him, but he forced himself on.

Tasting blood in his mouth, he stopped and sat down. Squatting on the powdery slope, he took the handkerchief from his pocket and touched his tongue and lips. The red stain formed the imprint of his shaky mouth, like an illicit kiss. Maitland felt the tender skin of his right temple and cheekbone. The bruise ran from the ear as far as his right nostril. Pressing a finger into the nasal cleft, he could feel the injured sinus and gums, a loosened eye-tooth.

Waiting for his breath to return, Maitland listened to the traffic moving above his head. The sound of engines drummed ceaselessly through the tunnel of the overpass. On the far side of the island the feeder road was busy now, and Maitland waved his raincoat at the passing cars. However, the drivers were concentrating on the overhead route indicators and the major junction with the motorway.

The towers of the distant office-blocks rose into the afternoon air. Searching the warm haze over Marylebone, Maitland could almost identify his own building. Somewhere behind the glass curtain-walling on the seventeenth floor his secretary was typing the agenda for the following week's finance committee meeting, never thinking for a moment that her boss was squatting on this motorway embankment with a bloody mouth.

His shoulders began to shake, a rapid tremor that set off his diaphragm. With an effort Maitland mastered the spasm. He swallowed back the phlegm that choked his throat and stared down at the Jaguar, thinking again about the crash. It had been stupid of him to ignore the speed limit. Eager to see Catherine again, he was looking forward to relaxing in their cool, formal house with its large white rooms. After three days with Helen Fairfax, in this sensible woman doctor's warm and comfortable apartment, he had felt almost suffocated.

Standing up, Maitland edged sideways across the slope. Ten feet above him was the hard shoulder of the motorway, and the palisade of wooden trestles. Maitland tossed his briefcase up the slope. Moving like a crab on his feet and forearms, he climbed the more shallow soil, reached both hands on to the concrete shoulder and pulled himself on to the road.

Exhausted by the climb, Maitland sat down unsteadily on a wooden trestle. He brushed the dirt on his hands against his trousers. The briefcase and raincoat lay at his feet in a grimy bundle like the luggage of a tramp. Sweat bathed his shirt inside the jacket, soaking through the fabric. The blood was thick in his mouth, but he sucked it back without a pause.

He stood up and turned to face the oncoming traffic. Three lines of vehicles sped towards him. They emerged from the tunnel below the overpass and accelerated along the fast bend. The rush-hour had begun. Magnified by the roof and walls of the overpass, the noise reverberated off the concrete roadway around Maitland, drowning his first shouts. Now and then an interval of fifty feet appeared between the speeding vehicles, but even during these first minutes as Maitland stood there, waving his briefcase and raincoat, the hundreds of cars carrying their homeward drivers pressed closer together, almost bumper to bumper.

Maitland lowered the briefcase, watching the traffic roar past him. The red pinewood trestles had been knocked back by the speeding vehicles into a loose line. Lower in the western sky, the strong sun shone directly into the drivers' eyes as they emerged from the overpass into the fast right-hand bend.

Maitland looked down at himself. His jacket and trousers were stained with sweat, mud and engine grease – few drivers, even if they did notice him, would be eager to give him a lift. Besides, it would be almost impossible to slow down here and stop. The pressure of the following traffic, free at last from the long tail-backs that always blocked the Westway interchange during the rush-hour, forced them on relentlessly.

Trying to position himself more conspicuously, Maitland edged along the narrow road shoulder. No pedestrian or emergency verge had been provided along this fast bend, and the cars speeding past him at sixty miles an hour were no more than three or four feet away. Still carrying the raincoat and briefcase, he moved along the line of trestles, steering each one out of his way. He waved his hat in the exhaust-filled air, shouting over his shoulder into the engine noise.

'Emergency…! Stop…! Pull over…!'

Two trestles kicked together by a passing truck blocked his way. The lines of traffic swept by, swerving under the route indicators towards the junction ahead. Brake lights pumped, and the sunlight flared off the windshields in electric lances.

A horn blared warningly behind Maitland as he climbed around the trestles. A car plunged within inches of his right hip, an angry passenger whirling in a window. Maitland pulled himself back, and saw the white hull of a police car in the far lane. It was moving at a steady fifty miles an hour, a few feet behind the bumper of the car in front, but the driver looked over his shoulder at Maitland.

'Slowdown…! Police…!'

Maitland waved both the hat and briefcase, but the police car had been carried away by the rush of traffic. Trying to follow it on foot, Maitland was almost hit by the fender of a passing taxi. A black limousine swept towards him out of the tunnel, the uniformed chauffeur seeing Maitland at the last moment.

Realizing that he would be crushed against the trestles, Maitland moved away from them. His right hand smarted from a passing blow. The skin had been torn by a piece of sharp windshield or wing-mirror trim. He wrapped the blood-stained handkerchief around it.

Three hundred yards away, beyond the eastern entrance of the overpass, was the call-box of an emergency telephone, but he knew that he would be killed if he tried to walk through the tunnel. Maitland edged back along the hard shoulder and took up his position at the point where the Jaguar had left the road. He put on his raincoat and buttoned it neatly, straightened his hat and waved calmly at the passing vehicles.

He was still standing there as dusk began to fall. Headlamps swerved past him, their beams cutting across his face. Horns blared endlessly as the three lines of vehicles, tail lights flaring, moved towards the junction. The rush-hour was in full swing. As Maitland stood weakly by the roadside, waving with a feeble hand, it seemed to him that every vehicle in London had passed and re-passed him a dozen times, the drivers and passengers deliberately ignoring him in a vast spontaneous conspiracy. He was well aware that no one would stop for him, at least until the rush hour was over at eight o'clock. Then, with luck, he might be able to attract the attention of a solitary driver.

Maitland lifted his watch into the glare of the passing headlamps. It was seven forty-five. His son would long since have reached home alone. Catherine would either have gone out or be making dinner for herself, assuming that he had decided to stay on in London with Helen Fairfax.

Thinking of Helen, ophthalmoscope in the breast pocket of her white coat, peering critically into the eyes of some small child at her clinic, Maitland looked down at the wound on his hand. He was now more tired and shaken than at any time since the crash. Even in the warm, exhaust-filled air he shivered irritably; he felt as if his entire nervous system was being scraped by invisible knives, his nerves drawn through their slings. His shirt clung to his chest like a wet apron. At the same time a cold euphoria was coming over him. He assumed that this light-headedness revealed the first symptoms of carbon monoxide poisoning. He waved at the cars lunging past him in the darkness, and tottered to and fro like a drunken man.

An articulated fuel tanker bore down on him along the outer lane, its yellow bulk almost filling the tunnel below the overpass. As it laboured around the bend the driver saw Maitland staggering between his headlamps. Air brakes hissed and slammed. Maitland side-stepped casually out of the tanker's way, took off his hat and tossed it under the massive rear wheels. Laughing to himself, Maitland watched it vanish.

'Hey…!' He gestured with his briefcase. 'My hat -you've got my hat…!'

Horns blared around him. A taxi pulled almost to a halt, the fender brushing Mainland's legs. Glaring down at Maitland, the driver tapped his forehead as he surged away. Maitland waved him on gallantly. He knew already that he was too exhausted to control himself. His one hope was that he might become so deranged that people would stop simply to prevent him from damaging their cars. He looked at the blood from his mouth on the back of his fingers, but flung the hand away and turned to the passing traffic. Gazing up at the maze of concrete causeways illuminated in the night air, he realized how much he loathed all these drivers and their vehicles.

'Stop…!'

He shook his blood-smeared fist at an elderly woman driver watching him suspiciously over her steering wheel.

'Yes, you…! You can go! Take your damned car away! No – stop!'

He kicked a wooden trestle into the road, laughing as a passing truck knocked it back at him, jarring his left knee. He pushed out another.

His voice rose to a harsh shout above the traffic sounds, a bitter, primal scream.

'Catherine…! Catherine…!'

With cold anger he shouted her name at the cars, screaming it like a child into the swerving headlamps. He lurched into the roadway again, blocking the outer lane and waving his briefcase like a demented race-track official. Surprisingly, the traffic responded to him, thinning out slightly. For the first time a gap appeared in the stream of vehicles, and he could see through the tunnel to the Westway interchange.

Across the road from him was the central reservation, a narrow island four feet wide with a maintenance walk between the crash barriers. Maitland leaned against a trestle, trying to rally all his powers of self-control. He was aware of half his mind revelling in this drunken tantrum, but with an effort mastered himself. If he could cross the road, he would then be able to walk back to the Westway interchange and find an emergency telephone.

He straightened himself, annoyed that he had wasted time. Clearing his head, he waited for a break in the traffic stream. A dozen cars moved towards him in procession, followed by a second group, an airline coach taking up the rear. A breakdown truck towing a damaged van roared past Maitland, blocking his vision as he leaned back in the darkness, watching the play of headlamps in the approaches to the tunnel.