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Virginia Driver Education. Module Three. Vision, Vehicle Balance and Laws of Nature. Virginia Department of Education. Module Three. Vision, Vehicle Balance and Laws of Nature Topic 1 Starting, Securing and Exiting Topic 2 Vision and Driving Topic 3 Steering and Braking

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slide1

Virginia Driver Education

Module Three

Vision, Vehicle Balance and Laws of Nature

slide2

VirginiaDepartment of Education

Module Three

Vision, Vehicle Balance and Laws of Nature

Topic 1Starting, Securing and Exiting

Topic 2Vision and Driving

Topic 3Steering and Braking

Topic 4Laws of Nature

Topic 5Establishing Vehicle Reference Points

slide3

Topic 1 - Starting Tasks

  • Check/set park brake (P) and place
  • Right foot on brake pedal, heel on floor
  • Left foot on “dead pedal” for balance
  • Key in ignition, and turn to start
  • Check alert, warning lights and gauges
  • Adjust ventilation, accessories, etc
  • Turn headlights on
slide4

Securing the Vehicle

  • Find a legal, safe parking place
  • Stop and set parking brake
  • Shift gear selector to (P)ark (Shift to Reverse if Manual Transmission)
  • Close windows
  • Turn off accessories
  • Turn ignition switch to “off”
  • Lock ignition switch and remove key
  • Unfasten occupant restraints
slide5

Exiting the Vehicle

  • Check traffic flow to rear prior to opening door
  • Monitor door swing into adjacent lane or when parked next to another vehicle
  • Exit quickly to avoid conflict with traffic
  • Lock doors
  • Walk toward rear of the vehicle facing traffic
slide6

Topic 2 - Vision and Driving

  • Drivers base about 90% of all driving decisions on what they see, and 10% on what they hear or feel
  • Drivers must be able to look far enough ahead to make good decisions about speed, lane position, signs, signals, markings, and potential hazards
  • Drivers must be able to see near and far--close enough to read the speedometer, and far enough ahead to see/adjust for hazards
slide7

Visual Testing

Visual acuity is the measurement of the finest details which can be seen in optimal light conditions

slide8

Effective Use of Visual Fields

The Three Visual Fields

    • Fovea Vision
      • Visual Lead, Targeting, Signs, Signals
  • Central
    • Referencing, Path of Travel
  • Peripheral Vision
    • Motion and Color Changes
slide9

The Fovea Vision Area

Located at the center of the central vision area, the fovea is a small part of the retina and is responsible for our highest visual acuity

slide10

Central Vision

Central Vision Area (Inner Fringe)

An area 35 to 38 degrees around foveal vision used for:

  • Referencing Vehicle Position to Roadway
  • Viewing Path of Travel
central vision at night
Central Vision at Night
  • The human eye’s field of vision is much smaller without the help of natural light
  • Depth perception, visual acuity, and color recognition are all compromised at night
  • Minimize glare by looking at the bottom right of the road to avoid approaching headlights
  • Keep it dark in the car
  • Slow down to give yourself longer to react
slide12

Peripheral Vision

Approximately 90%of vision to each side

Increases total field of vision to about 180-190and is used to see:

  • Objects to the side
  • Movement and color changes to the side
slide13

Peripheral Vision and the Driving Task

Drivers use peripheral vision to:

  • See color and object movement
  • See signal changes, road signs, warning lights on the dashboard
  • Monitor traffic
  • Stay within the lane
slide14

Night Time Peripheral Vision

  • Is reduced dramatically due to lack of light to retina and glare
  • While Foveal and Central Vision are also reduced, they become more critical for searching for problems
slide15

Vision is Affected by

  • Smoke
  • Age
  • Dirty Windshield
  • Poor Windshield Wipers
  • Poor night vision
  • Night Blindness
  • Speed
  • Fatigue
  • Drugs
  • Poor weather
  • Darkness
  • Glare
  • Inattention
slide16

Depth Perception

  • Need both eyes to judge the distance between two objects
  • Depth perception allows you to:
  • judge gaps in traffic when turning, merging, or passing
  • judge distance when approaching a vehicle or obstruction
slide17

Poor Depth Perception

  • Stop too far from the stop line or intersection
  • Stop too close to vehicles ahead
  • Move into gaps that are too small
  • Look for gaps that are larger than needed to perform a maneuver
  • Follow other vehicles at unsafe following distance
  • Hit parked cars when parking
  • Have “close calls” when entering traffic, passing, etc.
slide18

As speed increases

    • Central vision decreases and blurs
    • Peripheral vision decreases
    • Changes in steering exaggerate vehicle movement

VISION FIELDS NARROW

slide19

Ways to Improve the Vision Fields

  • Clean windows—inside and out
  • Clean lights—be sure they work
  • Check defroster and wiper blades
  • Remove any objects that interfere with vision
  • Adjust mirrors properly
  • Keep sunglasses, flashlight, windshield scraper in vehicle
slide20

Line of Sight

  • Line-of-sight is the distance you can see in your path of travel
slide21

Line-of-Sight (LOS) Restrictions

  • Vision is blocked, speed and position adjustments may be needed until LOS is restored
slide22

Path-of-Travel (POT)

  • The space the vehicle will occupy while traveling to the target area
slide23

Examples of Path-of-Travel Restrictions

  • Space is not available for the vehicle

Vehicle stopped or blocking intersection

Narrow lane and no shoulder

slide24

“Target” Far Ahead in the Path of Travel

Identify the target in this driver’s path of travel

A “Target” is an object or place far ahead in the center of your path of travel

slide25

Target AREA Provides the BIG Picture

The Target area is the area drivers must scan to the left and right of the target

Target Area

slide26

Advantages of Targeting

  • Easier to track vehicle in a straight line
  • Driver looks far ahead of the vehicle, and at the same time gathers information close to the vehicle
  • Driver can plan ahead to better manage risks
  • Targeting develops visual skills essential for managing traction loss and steering control
slide27

The Pavement Around Your Vehicle You Cannot See From the Driver’s Seat

The driver cannot see anything on the ground in the area outlined above—cars are used to show the size of this area

slide28

Determining Driver Blind Areas

Marker (foot or cone)

Place markers (cones, people) at the point where the driver can see the marker, (cone, person’s foot) in contact with the ground

slide29

Using Lane Position to Maximize LOS

1

  • Select the lane position that gives you the best line of sight and safest path of travel
  • Lane positions are based upon an average lane size of 12-feet wide, and a vehicle 6-feet wide

2

3

4

5

slide30

Lane Position 1

2-3 Feet

2-3 Feet

Positioned in the center of lane with an equal buffer of space on either side

slide31

Lane Position 2

3-6 Inches

Allows for 6 feet of space to the right of the vehicle. Used to prepare for a left turn or when avoiding a problem to the right of the vehicle.

slide32

Lane Position 3

3-6 Inches

Allows for 6 feet of space to the left of the vehicle. Used to prepare for a right turn or when avoiding a problem to the left of the vehicle.

slide33

Lane Positions 4 and 5

4

5

Lane positions 4 and 5 – straddling the line to avoid a problem within a lane

slide34

Topic 3 - Basic Maneuvers -- Steering

  • Holding the upper half of the wheel can result in excessive steering, air bag injuries, and upper body fatigue
  • Hands located on lower half of the
  • wheel offers:
  • Relaxed, balanced control
  • Reduces unwanted steering wheel movement
  • Improves stability by lowering the body’s center of gravity
slide35

Hand-to-Hand/Push-Pull Steering

Hand-to-Hand Steering/Push-Pull

Right Turn

Left Hand Pushes Up from 8 to 11

Right Turn

Right Hand Pulls Down from 1 to 4

slide36

Hand-Over-Hand Steering

Used at Speeds below 15 mph

Used for slow, tight turns - Arms cross on the top 1/3 of the wheel until desired path of travel is reached

Left Turn/left hand

Left hand pulls down, then reaches up to about the 11 o’clock position and continues to pull 11-12 down to the left

Left Turn/right hand

Right Hand pushes up to about the 11 o’clock position

slide37

One-Hand Steering

  • Is used when:
  • Backing straight--hand holds top of wheel
  • Backing a trailer--hand holds bottom of wheel

Backing Position

slide38

Covering the Accelerator

  • Used for a smooth transition from braking to accelerating
  • Allows the vehicle to coast which may speed up or slow down the vehicle
  • Permits the driver to be prepared for any needed acceleration
slide39

Foot Pedals

Right foot pivots between brake and accelerator

Brake

Accelerator

Dead Pedal

Left foot “rests” on dead pedal

slide40

Acceleration Techniques

  • Progressive, Smooth Acceleration
    • Heel pivots foot from the brake to the accelerator
    • Gently apply pressure to the accelerator pedal to gradually increase speed to minimize backward pitch and maintain vehicle balance
slide41

Acceleration Techniques (cont)

  • 2. Thrust Acceleration
    • Typically used when passing or merging into higher speed traffic
    • Greater pressure is applied to accelerator pedal to rapidly increase speed without losing tire traction
slide42

Braking Techniques

Smooth braking technique:

  • Is a trait of a skilled driver
  • Saves wear and tear on the brake system and tires
slide43

Methods to Reduce Speed

Release the Accelerator

  • Most frequently used method to slow vehicle speed
  • Gradually reduce pedal pressure to avoid abrupt changes in speed
slide44

Methods to Reduce Speed

2. Controlled Braking - When releasing the accelerator is not enough

  • Check the rear view mirror
  • Release accelerator and apply smooth, steady pressure on the brake pedal
  • For a smooth STOP, gently ease off the brake a few seconds before stopping to reduce the vehicle’s weight shift so the car does not pitch forward then backward during the final phase of stopping
slide45

Methods to Reduce Speed (cont)

3. Threshold Braking in an Emergency

Slows the vehicle as quickly as possible without locking brakes or losing traction

  • Release accelerator while checking traffic behind
  • Exert forceful pressure on brake pedal and you will feel the vehicle weight shift forward
  • If you feel the wheels begin to slide, ease the pressure on brake pedal so the tires can begin rotating again
slide46

Methods to Reduce Speed (cont.)

4. Trail Braking – Used for Sharp Turns

Occurs at the transition point where you slightly reduce pressure on the brake pedal to allow the vehicle to begin to regain speed before applying the accelerator

slide47

Trail Braking

1. Use controlled braking prior to reaching the curve

2. Begin easing off brake, and trail brake with very light pressure until halfway through the turn,

3. Accelerate out of the turn

anti lock braking system abs
Anti-Lock Braking System (ABS)

ABS allows maximum stopping force without locking up the brakes (skidding)

If standard brakes are applied too hard, the wheels "lock" or skid, and you lose steering control.

slide49

Anti-Lock Braking System (cont)

If steering control is lost, the vehicle skids in a straight line wherever it is going

ABS is an anti-lock/anti-skid brake system that allows the driver to steer during hard braking

slide50

Anti-Lock Braking System (cont.)

  • The ABS warning will come on when there is a problem with either the ABS brake system, normal brake system, or the brake fluid is low in the master cylinder or the ABS brake system
  • To find out if a vehicle is equipped with ABS, turn on the ignition and check the instrument panel for the ABS indicator light
slide51

Practice Activating ABS

  • In a parking lot, go 20-25 mph and execute an emergency stop to engage ABS
  • Keep your foot firmly on the brake even when you feel the brake pulsate and/or hear noise
  • This computerized pumping action can pump the brakes up to 15 times per second
slide52

Myths about ABS

  • There are fewer fatal crashes for cars equipped with ABS

False, some drivers panic and/or release the brake when it pulses

  • Don’t use ABS brakes on a slippery surface
  • False, ABS shortens stopping distance and improves control on a slippery roads
slide53

Maintaining Vehicle Balance

  • Vehicle balance is the distribution of the weight of the vehicle on the tires
  • Optimum balance is reached when the vehicle is not moving or is moving in a straight direction at a constant speed
  • As soon as the vehicle accelerates, brakes, or turns, the balance is changed and the weight transfer changes the size of the tire patches
slide54

Gravity

The natural force that pulls all things to Earth

  • Throw a ball into the air and what happens?
  • Gravity gives objects their ___________gravity
  • The center of gravity is where a body’s mass is ___________
slide55

Energy of Motion = Speed x Mass

The white truck and the dump truck are going the same speed

Which vehicle has more energy of motion?

Why?

slide56

Effect Of Speed And Weight

  • The kinetic energy of a 4,000 pound vehicle traveling at 100 mph is equal to 1.36 million foot pounds – enough to lift a 175 pound man 1.5 miles!
  • To stop a vehicle going 60 mph would generate approximately enough heat to boil one-half gallon of water!
slide57

Inertia

  • Inertia wants to keep these parked vehicles at rest
  • Inertia also wants to keep these moving vehicles moving
slide58

Inertia(cont.)

When driving through this curve, inertia creates the sensation that you are being pulled toward the outside of the curve

Why?

Because you are traveling in a straight line, and inertia wants to keep you going in a straight line

slide59

Momentum = Mass x Velocity

  • Momentum is inertia in motion
  • Momentum is the product of speed and weight

A small truck filled with potatoes traveling at 20mph has more momentum that a 3,000 lb car traveling at the same speed

As momentum increases so does the potential for damage in a collision

slide60

Pitch, Roll, and Yaw

Pitch, Roll, and Yaw are the three axes running through a vehicle’s center of gravity

Yaw

Pitch

Roll

slide61

Vehicle Pitch

  • Vehicle’s weight shifts backward or forward

Forward Pitch

Changing Vehicle Load from Rear to Front

Backward Pitch:

Changing Vehicle Load from Front to Rear

  • Accelerating
  • Releasing the brake
  • Releasing the accelerator
  • Braking
slide62

Vehicle Roll

  • Roll: Vehicle’s weight shifts to the tires located on one side of the vehicle

Which direction is this driver steering to cause this weight shift? What causes a vehicle roll over?

slide63

Vehicle Yaw

  • Yaw: Fishtailing

No Yaw

Yaw

  • Vehicle’s rear tires lose traction and weight shifts to one side while opposite rear wheel moves toward front of vehicle
slide64

Steering For Balance And Control

  • Sit at a safe distance from the wheel
  • Use a balanced hand position
  • As speed increases, steering input is reduced for turns and other maneuvers

Photo courtesy of ADTSEA

slide65

Changes in Speed Affects

Balance and Control

  • Pushing or releasing the accelerator pedal is the primary method to adjust the speed of a vehicle
  • Changes in speed causes weight shifts to front or rear tires
  • Increases in speed with steering adjustments causes significant shifts in the vehicle’s weight
slide66

Braking Affects Balance and Control

How does braking affect balance and control in a front or rear-wheel drive vehicle?

slide67

Effect of Hard Braking and Steering

Load Decreasing

  • Applying hard braking causes weight to shift sharply to the front tires
  • If the weight shift exceeds available traction, the tires will skid and steering control is lost (under steer)

Load Increasing

slide68

Vehicle Suspension System

  • Helps to smooth out weight transfers
  • Helps keep all four wheels on the ground
  • Helps keep the vehicle level
slide69

Steering and Balance

Accelerating, braking, or steering shifts the vehicle’s weight from tire to tire and affects vehicle balance and control

Describe the driver’s action and how is it affecting this vehicle’s balance?

slide70

Maintaining Vehicle Balance

Describe the driving maneuvers that create these tire footprints

slide71

Maintaining Vehicle Balance (cont.)

Describe the driving maneuvers that create these tire footprints

slide72

Vehicle Load

Vehicle load capacity includes the combined weight of people, liquids and cargo that the vehicle is designed to safely handle

slide73

Effect of Load On Vehicle Balance

What could occur if the driver of this vehicle made a quick steering maneuver?

Photo courtesy of AAA Foundation

slide74

Vehicle Over Load

  • Operating a vehicle above the Gross Vehicle Weight Rating (GVWR) compromises safety
  • Frame, suspension, brakes and tires are not designed for weights above the rating the manufacturer has set
slide75

Standard Vehicle Reference Points

LEFT Reference Point

3 feet from line or median

6 inches from line or median

  • Relates a part of the vehicle to some part of the roadway
  • Know your vehicle placement within a lane at all times
  • Maneuver in confined places
slide76

Standard Vehicle Reference Points

RIGHT Reference Point

6 inches from line or curb

3 feet from line or curb

  • Relates a part of the vehicle to some part of the roadway
  • Know your vehicle placement within a lane at all times
  • Maneuver in confined places
slide77

Standard Vehicle Reference Points

Left Side Reference (3-6 Inches)

When you look at the curb, pavement line, or edge of the road, it appears to line up about one foot in from the left edge of the hood

slide78

Standard Vehicle Reference Points

Left-Side Reference Point

  • Used for:
  • Lane Position 2
  • Preparing for a left turn
  • Determining position for parking on the left side of a one-way street (3-6 inches from the curb or line)
slide79

Standard Vehicle Reference Points

Right Side Reference Point

Your vehicle is 3-6 inches from the curb, pavement line or edge of the road when the line appears near the center of the hood

slide80

Standard Vehicle Reference Points

Right Side Reference Points

  • Are Used:
  • To know where the curb or line is located
  • For Lane Position 3
  • For parking
slide81

Standard Vehicle Reference Points

To Position Vehicle Three Feet Away

When you look at the curb, pavement, or edge of the road, it appears to line up with the middle of the right- half of the hood

slide82

Standard Vehicle Reference Points

Right Side -- Three Feet Away

  • To position for a right turn or for
  • Lane Position 1
slide83

Standard Vehicle Reference Points

Front Limitation

To position 3-6 inches from the line in front of your bumper, stop when your line of sight runs under the side view mirror to curb in front

Reference point

Line of sight

Reference Point

slide84

Standard Vehicle Reference Points

Front Limitation

You will need to know where the front bumper of your vehicle is when you are:

  • At intersections
  • At a stopped position
  • When parking
  • At a crosswalk

STOP LINE

slide85

Standard Vehicle Reference Points

Front Limitation

When you look at the curb line it appears to line up with the side view mirror

slide86

Standard Vehicle Reference Points

Rear Limitations

LEFT

When you look back over your left shoulder, the curb or line appears to be in the middle of the left rear window

RIGHT

When you look back over your right shoulder, the curb or line appears to be near the rear window corner

slide87

Standard Vehicle Reference Points

Rear Limitations – How They are Used

LEFT

When backing to know where your rear bumper is

RIGHT

When backing around a corner, it’s the pivot point for turning, such as backing into a perpendicular parking space