2.4 Road Markings, Rumble Strips & Traffic-Calming Devices

2.4 Road Markings, Rumble Strips & Traffic-Calming Devices

Quick Answer: Road markings have the same force of law as signs or traffic signals. Yellow separates traffic moving in opposite directions; white separates traffic moving the same way. A solid line on your side means do not pass; a dashed line on your side means passing is permitted when safe. White diamonds mark HOV lanes. Rumble strips warn of a decision point ahead and will not damage a vehicle.

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Markings Are Law, Not Decoration

The single most quoted sentence in this part of the Driver Manual is that road markings have the same force of law as signs or traffic signals. Crossing a solid yellow line to pass is exactly as much of a violation as passing a No Passing Zone sign, and improper passing in a no-passing zone (N.J.S.A. 39:4-86) is worth 4 penalty points.

Two colour rules organise everything else:

• Yellow center lines separate traffic flow going in opposite directions.
• White lines separate traffic going the same way when there is more than one lane, and show the edges of roads.

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Centre-Line Patterns and What They Permit

That last row is the heart of most passing questions on the exam. Read the pair from your lane outward: your side decides your rights, and the opposite line decides theirs.

Solid lines between intersections show where not to pass — but they may be crossed with care when entering or leaving driveways in business or residential areas.

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Other Pavement Markings

• Road arrows — used with other signs, they show the correct direction a motorist must take in that lane. An arrow in your lane is a regulatory instruction, not a suggestion.
• Edge lines — separate the shoulder from the travel lane and show the edges of highways. Yellow edge lines mark the left edge of a divided highway; white edge lines mark the right edge.
• White crosswalks — indicate pedestrian crossing areas. Where stop lines are missing, stop before the crosswalk when required to stop by signs, signals, or for pedestrians.
• White stop lines — show where to stop at stop signs or traffic signals. A single solid white line across the road at an intersection means a motorist must stop behind the line.
• White special markings — spell out conditions such as STOP AHEAD, SCHOOL, and R X R as a motorist alert.
• White diamonds — indicate high occupancy vehicle (HOV) lanes reserved for a particular vehicle type or for vehicles carrying multiple riders. Posted regulatory signs identify which vehicles qualify and the hours the HOV restriction is in operation. HOV lanes may be marked both by signs and by white diamonds painted on the pavement.

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Traffic-Calming and Alerting Devices

Rumble strips. Transverse and longitudinal rumble strips are small indentations or narrow raised strips on the highway or shoulder. They exist to alert a motorist that there is a decision point ahead — for example a four-way intersection after miles of uninterrupted travel. By vibrating the steering wheel and making noise they wake a driver who may have dozed off, or caution one about danger ahead. Rumble strips will not damage a vehicle; they are meant to get a motorist to slow down, and they are almost always used together with a cautionary sign.

Speed bumps and speed humps. Both are speed-control devices, and the exam distinguishes them:

• A speed bump is a low ridge running across a street, designed to slow cars.
• A speed hump is a longer, flatter version of a speed bump — and it is described as being more raised.

Roundabouts. A roundabout is a one-way, circular intersection in which traffic flows around a centre island. Roundabouts are designed to meet the needs of all road users — drivers, pedestrians, pedestrians with disabilities, and bicyclists. Because roundabout traffic enters and exits only through right turns, the conflicting movements that cause the worst crashes at traditional intersections — chiefly the left turn across oncoming traffic — are eliminated, and the occurrence of severe crashes is substantially reduced.

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Reading the Pavement in Practice

Picture a two-lane rural road at dusk. You come over a rise behind a slow truck. Before you even consider passing, the pavement has already answered three questions:

1. Is the centre line dashed on my side? If not, the decision is over — no pass.
2. Where does the dashed line end? If solid lines begin before you can finish, the pass is illegal and unsafe.
3. Is there a yellow pennant on the left shoulder? That is a no-passing zone regardless of what the paint says next.

Add the manual's separate list of places where passing is forbidden — on a hill or curve, at a street crossing or intersection, at a railroad crossing, on narrow bridges, in underpasses or tunnels, and behind a vehicle that has stopped to let a pedestrian cross — and most passing questions answer themselves.

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Key Exam Traps & Common Misconceptions

• Trap 1: "Broken line" is not enough. It must be broken on your side. A dashed line on the other side gives them the pass, not you.
• Trap 2: The pass must be finished before the paint changes. Starting a legal pass does not entitle you to finish it across solid lines.
• Trap 3: White diamonds are HOV, not a warning. They mark a restricted lane, with signs stating vehicle type and hours.
• Trap 4: Rumble strips are harmless. They will not damage the vehicle; they are an alert, not a hazard to steer around.