Space Cushion, Lane Changes, Passing, Turning, Backing, Visibility, Hazardous Conditions, Aggressive Driving, Distraction, Fatigue and Emotions: Entering at Traffic Speed, the Four-Second Merge Gap, Keeping Pace, Space to Leave and Cross, the Three-Second Rule and Ten Cases for Four Seconds, Space Behind and to the Sides, Splitting the Difference, Blind Spots and Trouble Spots, Changing One Lane at a Time, Ten Seconds and 1,600 Feet to Pass at 55 mph, When Not to Pass and the Right-Lane Rule, Turning From and Into the Nearest Lane, Backing Only to Park or K-Turn, Seeing a Third of a Mile Ahead, People Who Cannot See You, Headphones and Rubbernecking, Gravel, Curves, 10 mph Less on Wet Roads and Half Speed on Snow, Studded Tires From November 15 to April 30, Hydroplaning Above 35 mph, Why Aggressive Driving Grows, Behaviors That Cause Trouble, Distractions Inside and Out, Fatigue Risk Groups and Warning Signs, Health and Emotions

Written for aiforu2 as the source for a practice-test bank and the on-device tutor for the Connecticut Class D learner's permit knowledge test. The facts follow the official manual; the wording is ours.

Source: Connecticut Driver's Manual (DMV, March 2023), Chapter 3 "Driving Behaviors", "Maintaining a Space Cushion" through "Dangerous Driving Behaviors" (pages 20–29).

Maintaining a space cushion

The more distance you keep from everyone else, the more time you have to react. Entering traffic, match its speed, using the ramp on high-speed roads to build speed rather than driving to its end and stopping, which leaves no room to accelerate and risks a rear hit from drivers watching the main road; if you must wait for space, slow on the ramp so you have room to speed up. Merging anywhere, changing lanes, entering a road or when lanes join, needs an opening of about four seconds, so that you and the vehicle behind each keep two seconds; never squeeze into a small gap, which shrinks fast. Keep pace: vehicles moving the same direction at the same speed cannot hit each other, while going faster means passing again and again, each pass a chance for a collision from an unexpected lane change or an oncoming car, and speeding saves only a few minutes an hour. Leaving the main road, keep up with traffic until you are on the exit ramp, and when turning off a high-speed two-lane road with traffic behind, avoid slowing too early, tap the brakes and slow quickly but safely. Crossing traffic needs an opening big enough to get all the way across: stop halfway only in a median wide enough for your whole vehicle; turning left, make sure no vehicles, bicycles or pedestrians block your path so you are not stranded across a lane; even on green, do not start across if vehicles block your way, since you can be ticketed for blocking an intersection; never assume another driver will share or give space, and do not turn just because an approaching vehicle shows a turn signal, which may be for a later turn or left on by mistake, especially on motorcycles, so wait until the driver actually turns; and cross railroad tracks only when you can do so without stopping on them. Ahead, rear-end crashes are very common and come from following too closely; use the three-second rule at any speed: watch the rear of the vehicle ahead pass a sign or pole, count "one-one-thousand, two-one-thousand, three-one-thousand", and if you pass the mark first, drop back and count again until you are at least three seconds behind. Use four seconds on slippery roads; when the driver behind wants to pass, slowing to make room and finish the pass sooner; behind motorcycles, which may fall, most likely on wet or icy roads, gravel and metal such as bridges, gratings and rail tracks; behind trucks, buses, vans and vehicles pulling campers or trailers whose drivers cannot see you and which block your view; when you are being followed closely (pull right and let them pass); when pulling a trailer; in darkness or bad weather; behind police, ambulances and fire trucks, which need room; behind transit buses, school buses and hazardous-materials vehicles that must stop at railroad crossings; and when stopped on a hill, where the vehicle ahead may roll back. Behind, keep a steady speed and signal early before slowing or turning; stop for passengers out of traffic; when parallel parking with traffic behind, signal, pull beside the space and let followers pass first; if you must drive slowly enough to hold others up, pull over when safe, using turnouts or passing lanes on two-lane roads; always check behind when slowing or stopping, especially quickly or where a follower would not expect it, such as driveways and parking spaces; and when tailgated, move right if there is a right lane, otherwise wait for clear road and reduce speed slowly to encourage passing, never slowing quickly, which invites a rear hit. To the sides, avoid driving beside other vehicles on multi-lane roads, moving ahead or dropping back; keep as far as possible from oncoming vehicles without crowding the center line, generally driving in the middle of your lane; make room for entering vehicles by moving over a lane when no one is beside you; keep extra space from parked cars, whose doors and occupants and sudden pull-outs threaten you; give extra space to pedestrians, bicycles and especially children, never sharing a lane with a pedestrian or bicyclist but waiting to pass in the adjoining lane; "split the difference" between two hazards such as oncoming and parked vehicles, leaving more room on the more dangerous side, such as where a tractor-trailer will pass; and take hazards one at a time, for instance slowing to let an oncoming vehicle pass before overtaking a bicycle so you can give it the required three feet. Drive where others can see you: avoid riding beside and slightly behind another vehicle in its blind spot, pass through a blind spot quickly, and never linger beside a truck or bus. Where people or traffic gather, room to maneuver shrinks, so slow in shopping centers, parking lots and downtowns; in rush hour; on narrow bridges and in tunnels; at toll plazas, where lanes change and vehicles stop and speed up; near schools, playgrounds and residential streets; and at railroad crossings, where you need room to cross and some crossings are bumpy, and where you never pass with a grade crossing ahead.

Changing lanes and passing

Where no signs or markings govern lanes, rules do, and you must always allow three feet passing a bicycle. Changing lanes includes moving between lanes, merging from a ramp and entering from the curb or shoulder, and you must check beside and behind for vehicles in the target lane: look in the rearview and side mirrors for vehicles in that lane and anyone about to pass; look over your shoulder toward the move to check the blind spot at the rear corners, invisible in mirrors; check quickly, glancing several times rather than staring, so traffic ahead cannot surprise you; check the far lane, whose driver may be aiming for the same lane; and take one lane at a time, as on stairs, since judging several lanes at once is hard and waiting for all to clear ties up traffic. When passing is permitted, judge the room and pass one vehicle at a time, never counting on time for several. Look ahead for things that could take your passing space: people or bicyclists near the road, a narrow bridge or other narrowing, ice, a pothole or debris. At 55 mph a pass takes about 10 seconds, during which you and an oncoming vehicle each travel over 800 feet, so you need more than 1,600 feet, about a third of a mile, of clear road and sight distance; oncoming vehicles look slower and farther than they are, a distant one seems to stand still, and one you can see closing may already be too close, so when unsure, wait. Never pass without room to return, do not count on others to make room, and return only when both headlights of the passed vehicle show in your rearview mirror. No-passing signs and markings mean you cannot see far enough; passing is dangerous where vehicles may enter or cross, such as intersections, railroad crossings and shopping center entrances, where your view of people, vehicles and trains is blocked and drivers turning right into the oncoming lane will not expect you; and never pass on the shoulder, paved or not, where drivers may pull off without looking. On multi-lane roads the left-most lane is for passing slower vehicles, and passing on the right risks a driver who cannot see you changing lanes into you; where your direction has fewer than three lanes, Connecticut law requires driving in the right lane except when passing, moving left with a signal only to turn left or exit on the left.

Turning and backing

Without signs or markings, turn from the lane closest to your intended direction into the lane closest to the one you left, crossing the fewest lanes, moving as directly as possible without crossing lane lines or interfering with traffic, and changing lanes afterward only when safe with a signal. On right turns do not swing left first, which makes the driver behind think you are changing lanes or turning left and try to pass on the right, or swing wide finishing, where far-lane drivers do not expect you; on left turns do not cut the corner so sharply that you hit someone from the left, while leaving room for oncoming left-turners; with two or more marked turn lanes, stay in your lane through the turn; and near bicyclists, know their position, never turn right immediately after passing one, and yield to bicycles when turning as to any vehicle. Backing in any travel lane is illegal and unsafe except to parallel park or make a three-point (K) turn, since drivers do not expect a vehicle coming back at them; if you miss a turn or exit, go on to a safe place to turn around, and never stop in a travel lane for confusion, a breakdown or a passenger, but keep moving until you can pull off. Back as little as possible, choosing pull-through parking spaces, and when you must: check behind the vehicle before getting in, since children and small objects are invisible from the seat; turn and look over your right shoulder through the rear window rather than trusting mirrors, which cannot show directly behind; back slowly, since steering is much harder in reverse; stop occasionally to check the mirrors where the vehicle's design blocks the rear view; and use a helper outside whenever possible.

Visibility

The single biggest contributor to crashes is failing to see what is happening. Look down the road, to the sides and behind, stay alert for the unexpected, use headlights at night and whenever seeing is hard, and pay attention. You must be able to see at least one-third of a mile, about 10 seconds, ahead; whenever a curve or hill blocks your view, assume an oncoming vehicle is just out of sight and never start a pass within a third of a mile of one. Check your mirrors going down hills and mountains, where vehicles, especially trucks and buses, build speed. Anyone who cannot see you may enter your path: a driver at an intersection or driveway blocked by buildings, trees or vehicles; a driver backing into the road or into or out of a parking space; a driver with windows covered by snow, ice or steam; pedestrians behind umbrellas or pulled-down hats; and people about to leave a vehicle or step from between parked cars, so give parked vehicles room. Do not take your eyes off the road for more than a few seconds; pull off to read a map, since drivers in many motorcycle, bicycle and pedestrian crashes reported looking but not seeing; do not wear headphones or earphones in both ears, illegal in many states and a barrier to horns and sirens; and do not slow to gawk at a crash, a traffic stop or roadside activity, since rubbernecking can put you into a slowed or stopped vehicle ahead and adds congestion.

Hazardous conditions

Some conditions demand slow speeds: sharp curves, slippery roads and standing water. Your only contact with the road is the tires, and grip depends on the tires' and the surface's type and condition, so keep tires in good condition and properly inflated; gravel and dirt give less traction than concrete or asphalt, lengthening stops and easing skids in turns. A vehicle goes much faster straight than in a curve, where too much speed breaks the tires' grip, so slow before the curve rather than braking in it. An intersection with a dead signal is treated as a stop sign. Slow at the first sign of rain, snow or sleet: on a wet road cut speed by about 10 mph, on packed snow by half with snow tires or chains, and on ice slow to a crawl or better yet do not drive. Studded tires damage roads and are barred in many places, but are permitted in Connecticut from November 15 through April 30. Clues to slippery spots: shady spots freeze first and dry last on cold wet days; bridges and overpasses ice before other pavement because no earth insulates them; ice near the freezing point turns wet and slicker than at colder temperatures; and the first minutes of rain on a hot day bring oil to the asphalt surface. On wet roads most tires grip up to about 35 mph; faster, they begin to ride the water like skis, hydroplaning, and in heavy rain can lose all contact, while bald or worn tires lose it at much lower speeds, so the cure is to slow in rain and on wet roads. If the tires seem to lose contact, ease off the gas, keep the wheel straight, turning only in an emergency and then slowly to avoid a skid, and do not try to stop or turn until the tires grip again.

Aggressive driving

Aggressive driving can grow into the violence called road rage and has killed drivers and passengers; it can happen without the driver noticing, and self-control is one of driving's responsibilities. Experts blame rising congestion, parents who model anger at other motorists, declining courtesy, more immature young drivers, conflicts from home, marriage, work and authority carried into the car, a sense of owning the space around one's vehicle, a belief that safer cars make everyone immune even at speed, and seeing the car as an extension of oneself. The solutions come from within: leave punishment to the police and report aggressive driving when you arrive; do not compete, and let racers pass; talk to passengers about an offense rather than retaliating with the car; postpone the trip, let a friend drive or take a taxi when you are angry; and give aggressive drivers the benefit of the doubt, since fatigue or inattention rather than malice usually explains them. Behaviors that cause trouble: blocking the passing lane, so stay out of the far left lane and yield right to anyone wanting to pass; tailgating, which has begun dozens of deadly altercations; changing lanes without signaling, cutting others off or leaving the signal on; obscene gestures, which have gotten people shot, stabbed and beaten, so wave with all your fingers; overusing the horn, so tap lightly if you must, think twice before honking hello to a pedestrian, and never honk the instant the light turns green; sitting in the right lane at a red light without turning right where turns on red are allowed; taking more than one parking space, using handicapped spaces, banging doors into neighbors, tapping cars while parallel parking or backing without looking; misusing headlights, so keep low beams except on unlit roads, dim for oncoming traffic, never retaliate against high beams, never approach from behind on high beams, dim as a passing vehicle draws alongside, and use the four-second sight-distance rule at night so you do not overdrive your lights; failing to move out of the right lane when traffic permits to let ramp traffic in; blocking traffic with a trailer or cumbersome vehicle instead of pulling over, or by chatting with a pedestrian from the road; alarms you cannot silence quickly; and eye contact with a hostile driver, which reads as a challenge, so get out of the way, do not acknowledge them, and if pursued drive not home but to a police station, convenience store or other well-lit public place.

Distractions, fatigue, health and emotions

A distraction is anything that takes your attention from driving, anytime, anywhere, and it causes collisions, injury, death, property damage and costly lawsuits; eyes off the road and hands off the wheel are obvious risks, and a wandering mind is just as dangerous, since eyes can gaze at objects the mind never sees. Inside the vehicle the distractions include dialing or talking on a phone, adjusting the radio, discs or climate controls, using GPS or DVD players or the dashboard panel, grooming, talking to passengers, tending children or pets, eating, drinking or smoking, reading maps or other material, and picking up dropped items; outside they include other traffic, a police stop, sunlight or sunset, people or objects in the road, crash scenes, construction and billboards. Prevent them: avoid arguments and emotional conversations; leave early and stop to eat rather than eating while driving; buckle children and give them books, toys or games; secure pets in carriers before moving; set controls before the trip, at normal stops or through a passenger; do not stare at distant things; plan the route beforehand and pull into a safe parking area to check a map; do not talk to friends in other vehicles or wear headphones; and stay focused and expect the unexpected. Recognize distracted drivers by drifting over lane lines or within the lane, inconsistent speed, busyness with maps, food, cigarettes or phones, arguments with passengers, and slow or commercial vehicles; give them room, follow 3 to 4 seconds back, and pass with great care since they may drift into you. You alone are responsible for driving safely and for everything inside the vehicle, and a crash while distracted is on you, not the distraction. Fatigue, from strain, repetition, illness or lack of sleep, impairs vision and judgment like alcohol and drugs, causes speed and distance errors, slows decisions, makes you irritable and can put you to sleep at the wheel; the groups at special risk are young adults 16 to 24, who need more sleep than most and have died in numbers from drowsy driving; people with untreated sleep disorders, since untreated obstructive sleep apnea makes falling asleep at the wheel seven times likelier; and shift workers and long-hours workers, since night shifts raise the risk nearly six times and rotating shifts and more than 60-hour weeks need particular care. Before a trip get 7 to 9 hours of sleep, plan breaks about every 100 miles or two hours, bring a companion to talk and share driving, and avoid alcohol and sedating medicines. Warning signs: turning up the radio or opening a window to stay awake, trouble focusing, keeping your eyes open or holding your head up, repeated yawning or eye rubbing, drifting from the lane, tailgating or missing signs and exits, daydreaming, restlessness, irritability or aggression, slowed reaction and judgment, and falling alertness and motivation. Prevent a fatigue crash by watching for the signs, stopping at the next exit or rest area or for the night, taking a 15- to 20-minute nap in a safe parking area, taking caffeine equal to about two cups of coffee for several hours of alertness without relying on it, combining caffeine with a short nap, avoiding driving between midnight and 6 a.m., and above all sleeping. Fatigue crashes are usually single-vehicle run-off-road crashes that end in a rollover or a fixed object; rumble strips, raised or grooved patterns on shoulders or in lanes, warn with a loud rumble and vibration, and hitting a shoulder strip means pulling off at once to check your alertness. Illness, even a cold, a stiff neck, a cough or a sore leg, affects driving, as do many over-the-counter and prescription medicines, so let someone else drive when unwell and consult your doctor about conditions. Emotions interfere with thinking, distract, raise risk-taking, and interrupt attention and information processing, so you may not drive well when overly worried, excited, afraid, angry or depressed: cool off with a walk or nap before driving; keep your mind on driving when down, perhaps with a non-distracting radio; leave early when impatient so you need not speed or dart through traffic, which can be fatal; or let someone else drive.

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