Overtaking a Tanker in a Construction Zone
You are driving a Toyota Hiace bus with eight passengers on the Lagos–Ibadan Expressway. At the Km 45 construction zone the carriageway narrows to one lane in your direction, and a double solid yellow centre line separates you from oncoming traffic. Ahead, a fuel tanker is crawling at 40 km/h, straddling the lane edge. Your speedometer reads 80 km/h. The road ahead is straight for about 500 metres, but a line of oncoming vehicles is approaching at roughly 80 km/h. A commercial bus is 10 metres behind you, flashing to overtake. Workers in reflective vests are standing about 30 metres beyond the tanker. Your destination is still 70 km away and you are already 25 minutes late. The tanker's left indicator begins to flicker, though it does not move left.
1. Decide whether to overtake the tanker, showing the reasoning behind your decision.
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Do not overtake. Three independent constraints rule it out. First, the double solid yellow line is a no-crossing marking; it is there because the construction zone has reduced sight distance and lane width. Second, the closing geometry is bad: you at 80 km/h and oncoming traffic at about 80 km/h close at 160 km/h, so 500 m of clear road is only about 11 seconds-not enough time to accelerate past a 40 km/h tanker, return to lane, and clear the workers 30 m beyond it. Third, the workers and the narrow lane leave no recovery space if the tanker drifts. Being 25 minutes late is irrelevant to the risk equation. The correct action is to reduce speed, hold a safe gap behind the tanker, and wait for a broken line and a genuinely clear overtaking zone, or follow it through the works.
2. What does the tanker's flickering left indicator change about your plan?
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The flickering left indicator is information, not an invitation. It may mean the tanker is turning into a site access, changing lane because of a pothole, or signalling a mechanical fault. You cannot assume it will move left and open a gap. Keep well back, because a heavy tanker turning left in a narrow construction zone will swing wide and may stop suddenly. Do not use the indicator as a reason to dive up the inside; the inside is where the workers and the lane edge are. If the tanker does move left, wait until it is fully clear of your path and until you can see that the oncoming lane is clear and the centre line is broken. Until then, the safe plan remains: stay behind, match speed, and preserve escape space.
3. How should you manage the commercial bus tailgating you?
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A tailgating bus behind you must not push you into an unsafe overtake. Increase your following distance from the tanker so you can brake gently and avoid a chain reaction; a larger gap ahead gives you more time to react and gives the bus less excuse to close up. Keep your speed steady and predictable, and avoid brake-checking. If the bus overtakes illegally across the solid line, do not race it or block it; ease off, let it clear, and keep your own lane position. If it remains glued to your bumper, look for a safe pull-off after the construction zone and let it pass. The goal is to separate the hazards-tanker ahead, bus behind, oncoming traffic, workers-not to win the argument.