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Harder braking or slower speed might have prevented an OC Transpo bus from hitting a Via train in September 2013, according to calculations made by the Transportation Safety Board.
The bus’s speed and braking were among the 15 contributing factors the TSB identified in its investigation of the bus-train crash that killed six in Barrhaven. The TSB calculated that the bus would likely not have hit the train if its brakes had been applied more forcefully or if the bus had been traveling at the posted speed limit.
The following animations, created by the Citizen based on the TSB’s reports, show three scenarios: One shows how the crash actually happened and the following two show the TSB’s alternate scenarios in which the bus stops in time.
Here’s how the crash actually happened.
The bus was travelling at 67.6 km/h when the driver hit the brakes 36 metres ahead of the rail crossing. The full force of the brakes was not applied — OC Transpo drivers are trained to brake more gently to prevent passenger injuries — and the bus hit the train less than three seconds later at a speed of 7.7 km/h. The train was going 75 km/h until it hit its brakes two seconds before impact and had slowed slightly to 69 km/h when the bus hit it.
2. Full-braking scenario
The TSB says if “maximum braking force” had been applied, the bus would still have crashed through the rail-crossing barriers but would have stopped 1.5 metres short of the train, avoiding impact.
3. Lower-speed scenario
If the bus had been traveling at the speed limit of 60 km/h, the TSB calculates that it would have stopped in 29.5 metres, just over six metres shy of the tracks and the fast-moving train.
查看原文...
The bus’s speed and braking were among the 15 contributing factors the TSB identified in its investigation of the bus-train crash that killed six in Barrhaven. The TSB calculated that the bus would likely not have hit the train if its brakes had been applied more forcefully or if the bus had been traveling at the posted speed limit.
The following animations, created by the Citizen based on the TSB’s reports, show three scenarios: One shows how the crash actually happened and the following two show the TSB’s alternate scenarios in which the bus stops in time.
- The crash
Here’s how the crash actually happened.
The bus was travelling at 67.6 km/h when the driver hit the brakes 36 metres ahead of the rail crossing. The full force of the brakes was not applied — OC Transpo drivers are trained to brake more gently to prevent passenger injuries — and the bus hit the train less than three seconds later at a speed of 7.7 km/h. The train was going 75 km/h until it hit its brakes two seconds before impact and had slowed slightly to 69 km/h when the bus hit it.
2. Full-braking scenario
The TSB says if “maximum braking force” had been applied, the bus would still have crashed through the rail-crossing barriers but would have stopped 1.5 metres short of the train, avoiding impact.
3. Lower-speed scenario
If the bus had been traveling at the speed limit of 60 km/h, the TSB calculates that it would have stopped in 29.5 metres, just over six metres shy of the tracks and the fast-moving train.
查看原文...
