Just after midnight on 7 April 1982, seven people died in the third (westbound) bore of the Caldecott Tunnel on State Route 24 between Oakland and Orinda, California, when a chain-reaction collision ruptured a gasoline tank trailer and ignited a pool fire that turned the 3,256-foot bore into a flue. The National Transportation Safety Board investigated the accident as case DCA82AH005 and published its findings as Highway Accident Report NTSB/HAR-83/01 on 3 May 1983. Its probable cause was unambiguous: a sequence that began with an intoxicated driver stopped in a through lane.
The trigger vehicle was a Honda driven by Janice Arlene Ferris, a 34-year-old San Leandro bookkeeper whose blood-alcohol concentration was measured at 0.17 — more than twice California’s then-legal threshold. Travelling westbound at roughly 12:12 a.m., she struck the tunnel’s raised curbs, lost control, and stopped in the left through lane about one-third to halfway into the bore, an unlit obstacle in a fast, dark tube. A following Kenworth double tanker hauling 8,800 US gallons (about 33,000 litres) of gasoline for Shell, driven by Mervyn Lee Metzker, struck the stopped Honda. An empty AC Transit bus then overtook and struck the tanker’s trailer, which overturned, split open, and spilled most of its load onto the roadway, where the gasoline pooled and ignited within seconds.
The NTSB found the cause in the human chain, not the hardware. Its probable cause was “a combination of events involving (1) the erratic driving by the intoxicated driver of a passenger vehicle which stopped in a through traffic lane creating a traffic obstacle; (2) the inattention of the truck driver causing his vehicle to strike the passenger vehicle; and (3) the bus driver’s overtaking the truck too rapidly to enable him to avoid striking the passenger vehicle when it unexpectedly appeared in the path of his bus.” The Board then separated cause from severity, attributing the death toll to the flammable cargo, the tanker damage that released it, and a tunnel with no monitoring, no variable message signs, and no way to talk to the people inside it.
Of the seven dead, several never left their vehicles. Ferris died of thermal burns, as did Metzker and the bus driver, John Dykes, who was ejected; two survivors were treated for smoke inhalation. The lasting legal consequence was regulatory: California subsequently barred gasoline tank trucks from the Caldecott Tunnel except during low-traffic early-morning hours.
On the afternoon of 11 July 1978, a road tanker carrying liquefied propylene ruptured beside the Los Alfaques seaside campsite at Alcanar, in the province of Tarragona on Spain’s Mediterranean coast, and detonated in a boiling-liquid expanding-vapour explosion that killed roughly 215 people and severely burned about 200 more. The dead were overwhelmingly holidaymakers — some 178 of them French — packed into a crowded July campground at the height of the season. It remains the deadliest road-transport and one of the deadliest civilian disasters in modern Spanish history.
The tanker, a Pegaso tractor unit hauling a Fruehauf trailer built in 1973, had left the ENPETROL refinery at La Pobla de Mafumet shortly after midday loaded with about 23.5 tonnes of propylene — close to four tonnes over the trailer’s design limit of 19.35 tonnes. It had travelled roughly 102 kilometres south along the coastal N-340 when, at around 14:35 beside the campsite at kilometre 159, the overpressurised tank split open. The escaping liquefied gas flashed into a vapour cloud that ignited almost instantly; the fireball charred everything within a radius of hundreds of metres and gutted the great majority of the camping area, where families were eating lunch, swimming, and resting in caravans and tents.
The cause was reconstructed by a Spanish judicial investigation, not a transport-safety board — Spain had no NTSB-style highway investigator — and the inquiry fed directly into a 1982 criminal trial. Its findings were mechanical and organisational at once: the tank had been loaded well beyond its rated capacity, leaving almost no ullage space for the propylene to expand; it carried no emergency pressure-relief valve (a fitting once mandatory but not required under the rules in force in 1978); and the steel showed microscopic stress cracks consistent with prior corrosion from improperly pressurised anhydrous ammonia. Overloading, the inquiry established, was routine at the refinery — dozens of tanks had left overweight in the preceding months.
In 1982, four employees of ENPETROL and two of the tanker’s operating company, Cisternas Reunidas S.A., were convicted of criminal negligence and sentenced to between one and four years’ imprisonment. On appeal, four were released and the sentences were suspended or reduced. The two companies paid compensation equivalent to roughly €13.23 million to the victims and their families. The disaster prompted Spain to bar the daytime transit of dangerous-goods vehicles through populated areas, and it became a reference case in the international study of BLEVE hazards in road transport.
On the evening of 7 July 1987, a five-axle articulated fuel tanker lost its brakes on the downhill approach to Herborn, a small town in the German state of Hesse, ran out of control into the town centre, overturned, and ignited; escaping fuel poured into the sewer system and set off a chain of underground explosions. Six people died and 38 were injured; twelve houses burned and seven were demolished. Five of the dead were killed directly by the flames or beneath the rubble; a sixth, a 64-year-old woman, suffered a fatal heart attack from the shock — which is why the toll is sometimes given as five and sometimes as six.
The tanker, a Mercedes-Benz 1635 S, was carrying about 28,000 litres of petrol and roughly 6,000 litres of diesel as it travelled east on the Bundesstraße 255 from the Koblenz direction. On the long descent toward Herborn its overheated, worn service brakes failed. The driver intended to take the slip road onto the BAB 45 motorway but could not slow enough to make the turn and rolled on downhill into the town. Crucially, the truck’s Daimler-Benz electro-pneumatic EPS transmission would not let him shift down to use the engine as a brake. The tanker tipped over in a sharp right-hand bend at about 20:43 and struck buildings at the Westerwaldstraße–Hauptstraße junction, near an ice-cream parlour. Some three minutes later the spilled fuel ignited in a flame tens of metres high; petrol that had run into the drains then deflagrated underground, hurling manhole covers as far as 700 metres away.
The cause was examined through criminal proceedings and a court-commissioned expert assessment — a Gutachten by Professor Bert Breuer of the Technische Hochschule Darmstadt — rather than by a transport-safety board, which is the correct way to characterise the finding. The court at Limburg an der Lahn established that a pressure loss in the air-brake system was the technical trigger, that the brakes were overheated and worn, and that the vehicle had been knowingly put into service in a no-longer-roadworthy condition. Breuer’s assessment held that a driver with a conventional manual gearbox could have used engine braking to compensate for the brake failure, and that the accident might not have happened at all in a truck without the EPS transmission.
The verdict came on 17 January 1990 after an eleven-month trial. The haulage-company owner, who had dispatched the vehicle, was sentenced to two and a half years’ imprisonment; the driver received eighteen months on probation and a fine of 6,000 Deutsche Mark. Two other defendants — a dispatcher and a workshop manager — were acquitted. Because the decisive failure was the organisation’s decision to operate an unroadworthy vehicle, the finding is recorded here as Operator.