Smoke at Mile Marker 141
2:15 p.m. on I-81 south near Hazleton. You are driving a 40-foot coach with 41 passengers and a relief driver riding in the jump seat. You notice a burning smell, then gray smoke coming from the rear engine compartment; the coolant temperature gauge is climbing past its normal band and the dash warning chime sounds. Traffic is moderate. The right shoulder is about 10 feet wide with a guardrail beyond it, and the nearest exit is 1.5 miles ahead. Among the passengers are six school-age children on a field trip, a 78-year-old woman with a folding walker, and a man in the third row who says he is a volunteer firefighter. The smoke thickens as you slow, and someone in row 12 shouts that they see flames.
1. Take the situation from the first sign of smoke to a stopped bus. What is the sequence, and why that order?
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Signal, slow smoothly, get as far right as the shoulder allows, and stop - do not try for the exit 1.5 miles away and do not brake hard.
Smooth is the point. A hard stop with people on their feet throws passengers into the aisle and turns a fire into a fire plus injuries. Coasting down on the shoulder also keeps you out of the travel lane, which matters because the next vehicle may not see the smoke until it is close.
When you stop: hazard flashers on, transmission in park or neutral with the parking brake set, engine shut down. Shutting down stops the fuel and the cooling fan but leaves the electrical system for the interior lights and the door. Keep the key where you can reach it; do not spend time chocking wheels or placing warning triangles while there is smoke in the cabin.
Tell the passengers what is happening in one sentence and give the first instruction immediately - "Smoke in the engine; leave everything; front door and the side windows; follow me." Silence from the driver is what turns a controlled evacuation into a panic.
2. How do you evacuate 41 people, including six children and a woman with a walker, and where do they go?
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Front door first, then the emergency exits you can reach - side windows and the rear exit. Leave bags behind; people who stop for luggage block the aisle for everyone behind them.
The six children get an adult each, assigned out loud, with a head count at the assembly point rather than at the door. For the woman with the walker, send two adults back for her, take her by the arms, and leave the walker on the bus; it is replaceable and it will jam the aisle. Your relief driver takes the rear exits while you work the front.
The firefighter is useful as an extra set of hands to move people and to keep the group together - he is not there to fight the fire. Do not let any passenger go back aboard for a phone or a purse.
Assembly is at least 100 feet away, upwind of the smoke, off the shoulder and behind the guardrail if there is room. Then count: 41 passengers plus two crew. If the count is short, you tell the first fire officer on scene how many are missing and where they might be, and you do not go back in yourself.
3. When, if ever, do you use the onboard extinguisher, and what do you do once everyone is off?
Read the worked answer
You use it only after everyone is off, only if the fire is small and you have a clear path to retreat, and never by opening the rear engine cover wide if you already see flames - that feeds oxygen to a fire that was starved of it. Many coaches have an access port or a small hatch for exactly this; discharge through it, stay low, and back away if the smoke color or volume changes.
A 5-pound dry chemical extinguisher is a tool for a fire that has just started, not for an engine fire that has been burning long enough to show flames at speed. If it is past that point, your job is distance and a phone call, not extinguishment.
Once everyone is off: call 911 with the interstate, direction and mile marker, and say how many people you have and that the bus is on fire. Move the group farther back if the wind shifts. Keep the count current as people are accounted for, meet the fire department with the passenger manifest, and do not move the bus or let anyone reboard until the fire officer releases it. Then notify the carrier.