Advisory Speed, Chevrons, and a Tailgater on a Wet Mountain Curve
You are driving a loaded pickup pulling a 6,000-lb trailer south on a two-lane state highway in the Arbuckle Mountains at dusk in light rain. A yellow diamond with a reverse-curve arrow is followed by a smaller yellow plaque reading 40 MPH. Beyond it, a series of yellow chevron signs points left around a blind curve. The posted speed limit is 55 mph. Your trailer tires are older, and you feel the trailer push slightly as you enter the first curve. A pickup behind you is tailgating closely. Your headlights are on, and the trailer has no anti-sway hitch. You must decide how to manage speed, lane position, and the tailgater before the second curve, where the chevrons continue but the pavement looks darker and possibly wetter.
1. Is the 40 MPH plaque a legal maximum speed? Explain how it relates to the 55 mph posted limit.
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The 40 MPH plaque is an advisory speed, not a legal maximum. It is a yellow warning sign with a yellow supplementary plaque, and it tells you a reasonable speed for the curve under favorable conditions. The white 55 mph sign remains the posted regulatory limit, so driving 40 is not legally required and driving 50 is not automatically illegal. But the advisory speed is evidence of the curve's severity, and in light rain, at dusk, with older trailer tires and a trailer that is already pushing, the safe speed may be below 40. The legal limit is a ceiling, not a target. Slow before the curve, not in it, and use the advisory plaque as a starting point for judgment rather than as a mandatory limit.
2. What do the chevrons indicate, and how should you use them for lane position with the trailer?
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Chevrons are alignment signs. They show the direction of the curve and help you track the roadway through a blind bend; they do not mean the road is a one-way street or that you may cross the centerline. Keep to the right of the centerline and use the chevrons to guide a smooth path. With a trailer, avoid a late, hard brake or a sudden steering correction because the trailer can push or sway. Reduce speed before the first curve, maintain steady throttle, and look through the curve toward the next chevron. The darker, wetter pavement before the second curve is a reason to slow further, not to hurry through while the tailgater is close.
3. The pickup behind you is tailgating. What should you do and not do before the second curve?
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Do not speed up to satisfy the tailgater. Increasing speed in rain on a curve with a loaded trailer raises your risk and reduces your margin if the trailer starts to sway. Instead, create space ahead so you can brake gradually, signal early, and keep a predictable path. If a safe pullout or wide shoulder appears, use it to let the tailgater pass, but do not wave the driver around on a blind curve. Avoid brake-checking. If the trailer begins to sway, ease off the accelerator and hold the wheel steady rather than braking hard. The tailgater's behavior is not yours to control; your job is to preserve a stable trailer and a safe following distance ahead.