The Pass That Almost Fits
You are on a two-lane rural highway posted 55 mph. Your student has been stuck behind a hay truck doing 28 mph for two miles. The road straightens: roughly 1,300 feet of clear pavement is visible, the centerline is dashed on your side, and a ranch driveway and county-road junction sit about 500 feet ahead of the truck. A motorcycle is oncoming, roughly 1,200 feet away, closing at about the limit. The truck's left turn signal is off, but it has drifted onto the shoulder twice in the last mile. Your student says, "Now - I can make it," and drifts toward the centerline.
1. Work the go/no-go decision quantitatively before you answer the student.
Read the worked answer
Estimate the closure, then compare it to the room you have.
- Relative speed on the truck: 55 − 28 = 27 mph, about 40 feet per second. To clear the truck plus safe gaps you need roughly 250–300 feet of relative travel - about 7 to 8 seconds alongside and ahead.
- Distance you travel in that time: at an average of about 60 mph, roughly 88 feet per second × 7.5 s ≈ 650 feet.
- Distance the oncoming motorcycle travels in the same 7.5 seconds: also about 650 feet.
- Combined closure: ≈ 1,300 feet. You have 1,200 feet. The maneuver does not fit, and the margin is negative before anyone accelerates harder than planned.
Verdict: no pass. The dashed line makes it legal, not possible.
Second, independent reason: the junction and driveway 500 feet ahead of the truck are places where a third vehicle can enter the lane you plan to occupy. Any pass that is still in progress at a junction is a pass you cannot abort cleanly.
Third: two shoulder drifts in a mile is information. That driver may be loaded unevenly, fatigued, or distracted - assume unpredictable and give more room, not less.
2. How do you handle the student's push and the tailgater behind you, and what is the teaching point?
Read the worked answer
Separate the decision from the pressure.
- Kill the maneuver first. "Not this one - stay right, hold your speed." Calm, no lecture while the car is moving.
- Name the pressure out loud. If a vehicle is stacked up behind you and the student feels rushed: "Their impatience is not a reason to take a risk they won't share." A driver who can say that out loud at 16 will still be able to say it at 40.
- Give the rule that transfers: set a decision point before you start - "if I am not fully past the truck by that driveway, I abort." Abort means brake, signal off, return right, and do not swerve. Deciding the abort point in advance is what keeps a marginal pass from becoming a head-on.
- Log it as an untaught skill. Your student has no passing practice at highway speed. This is a lesson you schedule deliberately (with an instructor-selected, low-traffic road), not one that happens to you at 55 mph.