Lane Travel: Speed, Pavement Markings, Space Cushion, Passing, Freeways and Towing: When You May Leave the Right Side, Half the Road With No Center Line, Stopping Before Entering From a Driveway, the 15, 20, 25 and 55 mph Limits, Variable Advisory and Variable Limit Signs, the Basic Rule, Slow Drivers, Racing, Pedestrian Death Risk at 23, 42 and 58 mph, Every Yellow, White and Red Marking, Two to Four Seconds of Following Distance and Seeing the Rear Tires, When to Add Space, Side and Rear Cushions, Backing, 359 Feet to Stop From 60 mph, Looking Ahead, Curves, Lane Changes, Passing and No-Passing Zones, Passing on the Right, Being Passed Without Flashing Signals, Freeway Entry, Ramp Meters, Exits, Breakdowns, and the Rules for Large Vehicles and Trailers

Written for aiforu2 as the source for a practice-test bank and the on-device tutor for the Oregon Class C knowledge test. The facts follow the official manual; the wording is ours.

Source: Oregon Driver Manual 2026–2027 (ODOT DMV), "Lane Travel" (pages 18–37).

Where to drive

Drive on the right except when passing a vehicle going your way, driving left of center to pass an obstruction, on a one-way road, on a three-lane road whose center lane is a passing lane, or when directed by emergency personnel or others directing traffic. On a road with no center line and two-way traffic, give oncoming traffic at least half the road, and whenever you must cross left of center for a hazard or any other reason, yield to oncoming traffic. Yielding means slowing or stopping so another vehicle or pedestrian can continue safely. Stop before entering or crossing a road from an alley, driveway or parking lot not controlled by signs or signals, and yield to approaching vehicles and pedestrians. Change lanes only when safe and avoid frequent changes.

Speed regulations

Besides the basic rule, Oregon sets maximum limits, the fastest speed considered safe under ideal conditions, in force whether posted or not unless a different speed is posted: 15 mph in alleys and narrow residential areas; 20 mph in any business district and in school speed zones; 25 mph in residential districts, public parks and on ocean shores open to vehicles; 55 mph on all other roads and highways unless posted otherwise; and varying limits on interstates. Digital signs with road, weather, traffic and visibility sensors have replaced some standard signs and may show the reason for a reduction: a variable advisory speed sign is yellow, says "advisory speed", recommends a speed for heavy traffic, poor weather or slippery roads, switches on and off as needed, and is not a limit though police may enforce it through the basic rule; a variable speed limit sign is black and white, says "speed limit", changes the limit for the same conditions, and is enforced like any limit sign. Slower speeds improve line of sight in fog, rain and snow and give more time to stop at sharp curves, steep hills and construction zones. The basic rule requires a speed that is reasonable and cautious for existing conditions, on all roads at all times: think about other traffic, pedestrians, bicyclists, the surface and width of the road, intersection hazards, weather and visibility; it never allows exceeding the limit, and an unsafe speed for conditions violates it even below the limit. If you drive slower than normal traffic, use the right lane or keep as close as possible to the right curb or edge unless preparing a left turn, watch for congestion behind you and pull off at the first safe place to let it pass. Racing, any acceleration or speed contest or attempt at a speed record, is illegal anywhere. A pedestrian hit at 23 mph has about a 10 percent risk of death, at 42 mph 50 percent, and at 58 mph 90 percent.

Pavement markings

Oregon's markings follow national standards and must be obeyed unless an officer or road worker redirects you. Yellow markings separate opposing traffic and mark the left edge of one-way roads and ramps, two-way left-turn lanes and painted medians: a solid yellow line marks the left edge of one-way roads and ramps; a broken yellow center line marks a two-way road where passing is allowed in both directions; a double center line of one solid and one broken yellow line allows passing from the side with the broken line and forbids it from the side with the solid line; double solid yellow lines forbid passing in both directions, though you may turn left across them to enter or leave a road after oncoming traffic clears; a two-way special left-turn lane, where provided, is the only lane you may turn left from, may not be traveled in, so enter just before the turn and wait there until traffic clears; a painted median with double solid yellow lines on both sides may be crossed for a left turn after yielding but never used as a turn lane or traveled in; and yellow diagonal stripes inside a median mark fixed objects or areas closed to vehicles, which may not be driven in or turned across. White markings separate same-direction lanes, mark the right edge, and form crosswalks, stop lines, symbols and words: a solid white line is an edge or fog line; a wide solid white line directs traffic into turn lanes or separates bike lanes, and crossing it is permitted but discouraged; a broken white line separates same-direction lanes and may be crossed with caution; a dotted white line, shorter dashes closer together, may be crossed with caution and, before an exit ramp or intersection, tells you your lane will not continue on the route (a turn-only or exit-only lane), at an entrance ramp that you must merge, and within an intersection guides you to the proper lane; a double solid white line, usually with a sign banning lane changes for a distance, means stay in your lane; a marked crosswalk is white lines where pedestrians cross, and you stop when one is in it; a stop line is a solid white line across the lane at the stopping point; a bike lane is a wide white line with a bicycle symbol or sign, sometimes painted green; a yield line is a row of triangles pointing at you at the yield point; and white chevrons mark fixed objects or areas closed to vehicles. Red markings designate transit-only lanes for buses, light rail or bikes, though not every transit lane is red: a solid red lane is not for cars and may read BUS ONLY, BUS BIKE ONLY or LRT, and striped red shows where you may enter it to turn, park or reach a driveway.

The space cushion

When another driver moves suddenly you need time to react, and the only way to be sure of it is space ahead, to each side and behind. Higher speed leaves less time to spot hazards, judge others' speed and react. A safe following distance is 2 to 4 seconds, and above 30 mph it should be 4 seconds or more. Check it by watching the rear of the vehicle ahead pass a sign or pole and counting; if you pass the mark before counting at least two seconds, drop back and count again until you are no closer than two seconds. When stopped behind a vehicle, be able to see where its rear tires meet the road, then return to a safe gap as traffic moves. Add more space on wet or slippery roads; when the driver behind wants to pass, slowing to make room in front for the pass to finish; behind bicycles and motorcycles, whose riders may lose control or stop suddenly; behind large vehicles whose drivers cannot see you directly behind and which block your view; with a heavy load or a trailer; in bad weather or darkness; when stopped on a hill, since the vehicle ahead may roll back; while learning to drive; and approaching or in a work zone. To the sides, be cautious alongside other vehicles on multi-lane streets and drop back or move ahead; keep as far as possible from oncoming traffic, driving in the center of your lane so you can move either way; make room for vehicles entering freeways by moving over a lane when no one is beside you and by slowing or speeding a little for a driver signaling a lane change; and keep extra space from parked cars, without leaving your lane, in case a door opens or someone steps out. Behind, keep a steady speed and signal ahead by gently pressing the brake so the lights warn followers; if someone tailgates and there is a right lane, move right, and otherwise slowly reduce speed to encourage passing, never braking hard, which can get you hit. When backing, drivers often fail to look both ways; mirrors give no full view, so turn your body and head to the right, look through the rear window, glance to either side for pedestrians and traffic, and back slowly.

Stopping distance and looking ahead

Stopping distance depends on road and weather, vehicle weight, reaction time and brakes, and it grows with speed even in ideal conditions; stopping takes longer than you think, and from 60 mph the distance from recognizing a hazard and braking to a full stop, about 359 feet, is more than a football field, compared with about 123 feet from 30 mph. Scan ahead as far as you can see, taking in the whole scene including the roadsides, to see pedestrians, hazards, vehicles that may enter your path and signs routing you elsewhere, and look for clues that a driver ahead will slow, such as a bicyclist or pedestrian ahead, brake lights or a turn signal. Slow before entering a curve, using any posted advisory speed as a guide, look through the curve to where you want to go, check the lane position of approaching vehicles, stay right of the center line in the middle of your lane, expect bicyclists, pedestrians or slow vehicles hidden around the bend, and accelerate gradually coming out.

Changing lanes and passing

Your blind spot is the area you cannot see from the seat even with mirrors; avoid riding in another driver's. Before changing lanes, signal, check the side and rearview mirrors for traffic behind, and glance over the left shoulder when moving left or the right shoulder when moving right. Passing is normal but dangerous: keep a good view by not following closely, especially behind trucks and trailers, know your vehicle's speed and acceleration, and be sure you have room, since cutting back too soon risks sideswiping and returning too late risks a head-on crash; when in doubt, stay in your lane. On a two-lane road pass only on the left, begin no earlier than the start of a passing zone, finish before entering a no-passing zone, and never exceed the limit while passing, which is illegal at any time. Check the path ahead, the mirrors and the blind spot over your shoulder, signal, speed up, complete the pass quickly, and when the passed vehicle shows in your rearview mirror, signal and return. Signs and markings show where passing is allowed; never pass where your view of oncoming traffic is limited, and do not cross the center line to pass in a no-passing zone marked by a solid yellow line (or when you cannot return before one begins), on hills and curves, when approaching, at or in an intersection or railroad crossing, or when the vehicle ahead is stopped at a crosswalk for a pedestrian; you may cross the center line in a no-passing zone only if the right side of the road is blocked or you are turning left. You may pass on the right only when the vehicle ahead is making or signaling a left turn, with room to pass without leaving the pavement or using a bike lane and a clear road ahead of it, or on a road with two or more same-direction lanes when the vehicle is in the left lane; use extra care, since drivers do not expect it, and never speed to pass. When being passed, stay right, check oncoming traffic and adjust your speed so the passer can return quickly, and never use your hands or lights to tell other drivers when to pass, which the law prohibits.

Freeway driving

Freeways carry several lanes each way at higher speeds and flow well because access is controlled with few sharp curves, no railroad crossings and no signals. Drive at a steady speed to reduce lane changes, since weaving raises crash risk and seldom saves time; keep pace with traffic without exceeding the posted speed, use the right lane if you drive below the flow, and adjust speed for entering vehicles. When traffic ahead slows, tap the brake pedal lightly several times to warn drivers behind. Entering a freeway is the opposite of entering most roads: use the on-ramp to speed up and merge with fast traffic, yielding to vehicles already on the freeway, checking mirrors and blind spots, matching their speed and keeping moving, because drivers behind expect you to speed up. If you start onto a freeway the wrong way, a Do Not Enter or Wrong Way sign warns you: pull to the side of the ramp at once, stop, turn on the hazard lights and cautiously turn around or back off the ramp. Ramp meters look like signals and run only at certain times, one per lane on multi-lane ramps; one vehicle goes on each green, after which you speed up to merge, and a dark meter means do not stop. To leave, signal well ahead, keep your speed until off the freeway, then slow to the posted advisory speed on the exit ramp; exits are numbered; if you miss yours, take the next, never stopping or backing up, and use the shoulder only in an emergency. With vehicle trouble, move to the right shoulder or an emergency stopping area, turn on the hazard lights, and stay in or near the vehicle on the side away from traffic rather than walking along the freeway.

Large vehicles and towing

Large vehicles and those towing trailers are longer, higher and wider, take longer to accelerate and stop and need more room to turn. Driving a pickup with a camper, a motor home or a trailer, check your speed and the traffic behind often, pull off at the first safe turnout when traffic stacks up, and use the right lane where two or more lanes run your way. Passengers may not ride in any trailer except a commercial bus trailer, an independently steered trailer or a fifth-wheel trailer, and a fifth-wheel carrying passengers needs safety glazing in its windows and windowed doors, a visual or sound signal to the driver, and an unobstructed exit that opens from inside and outside. Oregon allows towing at most one boat, utility trailer or other vehicle behind a passenger or recreational vehicle; a second trailer or vehicle is not allowed.

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