Sharing the road.

Most multi-vehicle collisions involve a failure of one driver to account for another road user's size, speed, visibility, or legal right-of-way. The truck driver who cannot see you because you are sitting in a blind spot. The cyclist who has nowhere to go because you passed with 18 inches of clearance. The pedestrian who assumed you would stop at the crosswalk. The emergency vehicle you did not hear because the windows were up and the music was loud.

The core skill is adjusting your driving to the road users around you. A highway shared with semi-trucks requires different following distances, different passing strategies, and different lane-change awareness than a residential street shared with children on bikes. Neither situation is difficult. Both require that the driver knows the specific adjustments and applies them consistently.

Nearly every collision pattern in this page follows the same structure: a driver did not know the rule, did not see the other road user, or knew the rule but did not follow it because it took a few extra seconds. The adjustments are small. The consequences of skipping them are not.

This page covers each road user type in detail: the specific distances, the blind spots, the collision patterns, and the behaviors that prevent them. Much of this was covered in driver's education. Most of us could use the refresher, because the habits that erode over years of routine driving are the same habits that prevent fatalities.

Motorcyclists are roughly 29 times more likely to die in a crash than passenger car occupants per vehicle mile traveled, according to NHTSA. Per vehicle mile, they are also four times more likely to be injured. In 2022, 6,218 motorcyclists died on U.S. roads. In the majority of fatal multi-vehicle motorcycle crashes, the car or truck driver failed to see the motorcycle. The motorcycle was there. The driver's eyes did not find it.

The most common fatal scenario has a name: the left-turn collision. A car or truck turns left at an intersection, directly into the path of an oncoming motorcycle. The car driver either did not see the motorcycle at all, or saw it but misjudged its speed. Motorcycles are small and narrow, and the human brain is not well calibrated to judge the approach speed of small objects. Studies show that drivers consistently underestimate how quickly a motorcycle is approaching.

Why motorcycles are hard to see

A motorcycle is roughly two feet wide, compared to six feet for a passenger car. This narrow profile is easily hidden behind a windshield pillar (the A-pillar), a side mirror, a roadside sign, another vehicle, or even a tree at the roadside. A visual scan that catches every car at an intersection may miss a motorcycle because the brain is pattern-matching for car-sized objects and the motorcycle does not trigger the same recognition.

Motorcycles also behave differently than cars in ways that can surprise drivers who are not expecting them. They can decelerate rapidly without brake lights when the rider downshifts. They may change position within their lane to avoid road hazards, adjust visibility, or set up for a turn. They accelerate faster than most cars and can appear to "come out of nowhere" when they were actually traveling at a consistent speed that the driver underestimated.

How to drive safely around motorcycles

• At intersections, look specifically for motorcycles before turning. This is the single most effective behavior. Before turning left, scan the oncoming traffic deliberately for small, narrow profiles. Look twice. A motorcycle that was hidden behind a car may become visible on the second look. Do not begin your turn until you are certain the path is clear.
• Give a full lane. A motorcycle is legally entitled to the full width of its lane. Do not share a lane with a motorcycle, and do not pass a motorcycle within the same lane. The rider may move to different positions within the lane for visibility, wind, road surface, or turning preparation. All of these lane positions are legal and intentional.
• Increase following distance to three to four seconds. Motorcycles stop faster than cars because of their lighter weight and high braking power relative to mass. Following too closely means you have less time to react if the motorcycle stops suddenly, and a rear-end collision with a motorcycle is catastrophic for the rider.
• Check blind spots before every lane change. A full head turn catches what mirrors miss. This applies to all road users but is most critical for motorcycles because of their narrow profile. A motorcycle can sit entirely within your mirror's blind spot.
• Watch for road hazards. Potholes, gravel, wet leaves, wet metal plates, railroad tracks, oil slicks, and painted lane markings that your car crosses without noticing can cause a motorcycle to lose control. If you see a rider swerve, they are avoiding something your car would have rolled over without issue.
• Give extra space in bad weather. Rain, wind, and cold all affect motorcycles more severely than cars. Wet roads reduce motorcycle braking performance, crosswinds push them laterally, and cold reduces tire grip. On days with poor conditions, give every motorcycle extra room.
• Check before opening your car door. On streets with parallel parking, look in the side mirror and over your shoulder before opening the driver's door. "Dooring" is when a parked driver opens a door into the path of a passing cyclist or motorcyclist. At even moderate speed, the impact is severe.

In 2022, 7,522 pedestrians were killed by motor vehicles in the United States, the highest number in over 40 years according to the Governors Highway Safety Association. Pedestrian fatalities have increased significantly over the past decade while overall traffic fatalities have remained relatively flat. The reasons are multiple: more distracted drivers, more distracted pedestrians, larger vehicles with higher front profiles, and higher vehicle speeds in urban areas.

Over 75% of pedestrian fatalities occur in dark conditions, according to NHTSA. The combination of reduced visibility, impaired drivers on the road at night, and pedestrians in dark clothing creates a lethal environment. Most of the remaining fatalities occur at or near intersections during daylight hours, where the driver failed to yield the right of way.

Right of way at crosswalks

Pedestrians have the right of way at all marked crosswalks. They also have the right of way at all intersections without marked crosswalks. These are called implied or unmarked crosswalks, and they exist at every intersection by default unless specifically prohibited by local law. The absence of painted lines does not mean the absence of a crosswalk.

When a pedestrian is in or approaching a crosswalk with the intent to cross, you must stop and wait. Do not wave them through and then start moving while they are still in the roadway. Do not pass another vehicle that has stopped at a crosswalk, because there may be a pedestrian hidden from your view by the stopped vehicle. Multiple-threat crashes, where a pedestrian is struck by a vehicle in the second lane after the first lane has stopped, are a documented and preventable collision pattern.

Specific pedestrian populations

• Children are the most unpredictable pedestrians. They may dart into the street from between parked cars, chase a ball, ride a scooter off a curb, or misjudge vehicle speed and distance. Children under 10 have limited peripheral vision, limited ability to judge the speed of approaching vehicles, and may not understand that a driver cannot see them. In school zones, residential neighborhoods, parks, and playgrounds, drive as if a child could appear at any moment.
• Elderly pedestrians may walk more slowly than the pedestrian signal timing allows. A crosswalk timed for a walking speed of 3.5 feet per second may not provide enough time for an older person walking at 2.5 feet per second. If you see an elderly pedestrian who has not completed their crossing when the signal changes, wait. They have the right to finish crossing.
• Distracted pedestrians looking at phones, wearing headphones, or engaged in conversation may step into the road without checking for traffic. This does not change their legal right of way at crosswalks, and it does not reduce your obligation to stop. Anticipate that pedestrians near intersections may not be paying attention.
• Pedestrians with disabilities may use wheelchairs, walkers, white canes, or guide dogs. They may cross more slowly, have limited visibility, or be unable to hear approaching vehicles. Yield completely and wait until they have cleared your travel lane before proceeding.
• Runners and joggers may run in the road, particularly on roads without sidewalks. They typically run against traffic (facing oncoming vehicles), which is the recommended practice. They may wear headphones and not hear your vehicle. Give them the same clearance you would give a cyclist.

Visibility after dark

A pedestrian in dark clothing on an unlit road is virtually invisible to a driver until the headlights illuminate them at close range. On low beam, headlights illuminate roughly 250 feet ahead. At 40 mph, your stopping distance is approximately 190 feet. That leaves roughly 60 feet of margin, which is less than one second of reaction time. On high beam, visibility extends to roughly 400 feet, doubling the margin.

In residential areas, near bars and entertainment districts, near transit stops, and on roads without sidewalks, reduce speed after dark and increase scanning for pedestrian shapes at the edges of your headlight range. Your vehicle's automatic emergency braking system, if equipped, provides a backup, but pedestrian detection is less reliable at night, especially for pedestrians in dark clothing.

School buses

When a school bus displays flashing red lights and extends its stop arm, all traffic in both directions must stop on an undivided road, regardless of the number of lanes. On a divided highway with a raised median, physical barrier, or unpaved median of five or more feet, vehicles traveling in the opposite direction are generally not required to stop. Laws vary by state. Know your state's specific law before you need it.

Remain stopped until the red lights stop flashing and the stop arm retracts. Children may be crossing the road, and they may not look both ways. The most dangerous zone around a school bus is the 10-foot area on all sides, particularly the front of the bus, where children cross the road and are below the driver's line of sight. A child who drops something in front of the bus and bends down to pick it up is invisible to the bus driver.

The signal sequence: yellow flashing lights mean the bus is preparing to stop. Begin slowing. Red flashing lights and the extended stop arm mean the bus is stopped and children are loading or unloading. Stop and wait. Fines for passing a stopped school bus range from $250 to over $1,000 in most states, with license suspension possible for repeat offenses. Many jurisdictions have added cameras to school bus stop arms to automatically photograph violators.

Farm equipment

Tractors, combines, grain carts, sprayers, and other farm equipment on public roads are legal and common in agricultural areas. They travel 15 to 25 mph, are often wider than a standard lane, and the operators may have limited rearward visibility and limited ability to hear approaching traffic over engine noise. You will encounter them on two-lane roads with limited passing opportunities, typically during planting season (spring) and harvest season (fall).

Look for the slow-moving vehicle (SMV) emblem: a reflective orange triangle with a dark red border displayed on the back of any vehicle that travels at 25 mph or less on public roads. This includes tractors, combines, horse-drawn vehicles, and some construction equipment. The emblem is your signal to reduce speed and prepare for a significant speed differential.

• Do not pass unless you have clear visibility. You need a legal passing zone, a clear view of oncoming traffic for at least a quarter mile, and enough distance to complete the pass before meeting oncoming traffic or reaching a curve. Farm equipment is wider than it appears from behind, and the pass takes longer than you expect.
• Watch for left turns into fields. Farm equipment may turn left into a field entrance without warning or with minimal signaling. The operator may not be able to hear your vehicle approaching. If the equipment slows or the driver looks to the left, anticipate a turn and do not attempt to pass.
• Equipment may extend beyond its visible profile. Attachments, towed implements, and folded equipment may extend beyond the edges of the tractor or be difficult to see from behind. Give extra clearance when passing.
• Be patient. The farmer is doing work that produces the food supply and would prefer not to be on the road. Plan extra time during planting and harvest seasons.

Work zones and construction

Work zone crashes kill over 800 people per year in the United States. The majority of fatalities are drivers and passengers, not workers, but worker fatalities are also significant. Fines are typically doubled in active work zones, and some states impose additional penalties.

• Slow down before the work zone, not in it. Speed reduction signs are placed in advance for a reason. Braking inside the zone, where workers may be steps from the travel lane, is more dangerous than arriving at the reduced speed.
• Merge early and cooperatively. When a lane closure is ahead, merge when signs indicate rather than racing to the closure point and forcing your way in. In some states, the "zipper merge" (merging at the closure point) is the recommended method. Follow the posted instructions. Either method works; aggressive, unpredictable lane changes do not.
• Watch for workers, flaggers, and equipment. Construction workers may be in or near the travel lane. Flaggers have legal authority to control traffic. Follow their signals as you would a traffic light. Equipment may enter the travel lane, back across it, or swing loads over it.
• Expect the unexpected. Lane shifts, temporary signals, uneven pavement, gravel, steel plates, narrow lanes, and sudden stops are all normal in work zones. Maintain extra following distance and stay focused.