Information Processing: Complex Risk Environments Section 5 (Day 5) Information Processing: Complex Risk Environments

Bell Ringer #5 Write a half a page red to red on the below statement. Save these to be turn in on test day. 10% of your grade It is sometimes said that borrowing money from a friend can harm or damage the friendship. Do you agree? Why or why not? Use reasons and specific examples to explain your answer.

Reminder Don’t forget to do daily quizzes on QUIA.COM Bring paper/pen/pencil and notebook Electronics are for instructional use with permission Don’t forget to do daily quizzes on QUIA.COM No Excuses why you don’t take Quizzes 1-6 before test day!! (Quizzes are worth 30% of grade) Attendance is MANDATORY!! (NO SLEEPING in class) All notes can be found on Harrisonburg’s staff website: http://staff.harrisonburg.k12.va.us/~tbutler/ If you are NOT taking notes in class, please be quiet and ask to use the restroom at the end of class.

This is what you are trying to get at the end of class.. “Green Card” Your Name Here Harrisonburg High School H.C.P.S 36 x 03/06/2012 This is what you are trying to get at the end of class..

Objectives: (Day 5) Students will understand three types of traction Students will understand driving on dangerous road surface conditions Students will understand traction loss considerations Students will understand driving off-road and recovery

Traction Traction is the grip between the tires and the road surface Traction allows a vehicle to start, stop, and/or change direction.

Traction Traction can be lost to the front tires or the rear tires. If the front and rear tires are actually leading the vehicle (sideways traction loss).

Traction

Static Traction A stationary vehicle parked on a flat surface with its brakes set is an example of static traction. It has the greatest resistance to movement.

Rolling Traction More traction between a rolling wheel and the road than there is between a sliding wheel and the road. Keep the wheels rolling and not lock the brakes when trying to steer or stop a vehicle that is sliding.

Sliding Traction There is greater traction between a stationary wheel and the road than there is between a sliding wheel and the road. Sliding traction does not grip the road.

Dangerous Road Surface Conditions Ice Ice, snow, or frost Wet--particularly the first 15 minutes of rain after a long dry period when oil and rubber particles have collected on the road surface and mix with water Heavy rain or standing water Mud near farm entrances, construction sites, and truck crossings Rain Snow Mud

Dangerous Road Surface Conditions Wet leaves Broken or uneven road surface Sand or gravel frequently found on curves in rural areas On improperly banked or flat curves, traction is more likely to be lost when roads are wet or slippery at slow speeds, or when dry at higher speeds NEGATIVE BANK

Causes of Traction Loss Condition of the Vehicle Brakes unevenly adjusted Brakes pulling in one direction Tires with unevenly worn tread Different tire pressure on opposite sides of the vehicle.

Causes of Traction Loss Driver Actions that may cause loss of traction Sudden steering actions Sudden changes in vehicle speed Panic stop or applying the brakes too hard Suddenly engaging the clutch Loss of traction also occurs with these driver’s actions at normal speeds on ice/snow or on roadways covered by sand, gravel, or water

Traction Loss Considerations Sudden shifts of vehicle weight causes traction loss - steering, braking and/or acceleration DROPS LIFTS

Traction Loss Considerations Force or Weight Movement When Brakes are Applied Too Hard or Quickly Weight Moves to the Front of the Car Causing a noticeable drop of the hood a noticeable rise of the rear deck forward movement of driver and passengers Rear LIFTS Front DROPS Force or Weight Movement Direction of Travel

Traction Loss Consideration When Acceleration is Applied Too Hard or Quickly Weight Moves to the Rear of the Car Causing a noticeable rise of the hood a noticeable drop of the rear deck rearward movement of driver and passengers Rear DROPS Front LIFTS Force or Weight Movement Direction of Travel

Traction Loss Consideration Force or Weight Movement When Steering is Applied Too Hard or Quickly Weight Moves to the Opposite Side of the Car Weight Movement Causes: a noticeable drop and tilt of the hood a noticeable rise and tilt of the rear deck driver and passenger movement towards the car’s corner Force or Weight Movement Front DROPS Rear LIFTS Direction of Travel

Traction Traction between the tires and the road does not remain constant. For example, sand, gravel, or water on the road decreases the level of traction. As speed increases, traction between the tires and the road decreases. With decreased traction, the possibility of skidding or sliding increases. DO NOT WRITE THIS SLIDE

Recognize Traction Loss The driver must recognize which part of the vehicle is losing traction in order to activate the technology needed to correct the problem.

Traction Loss to Front Tires If A Vehicle Keeps Moving Straight Ahead in Spite of Steering Efforts To the Contrary The Technical Term is Called “Understeer” front tires SLIDE rear tires PUSH Intended Path of Travel Actual Path of Travel

To Correct Front Traction Loss Intended Path of Travel Actual Path of Travel Activate ABS Steer Toward Targeted Path of Travel Adjust Steering Input as Needed to Maintain Targeted Path of Travel

Traction Loss to Rear Tires Identified by driver when front of vehicle moves to the left or right of travel path without steering input in that direction Technical term is “Oversteer” front tires ROLL rear tires SLIDE Intended Path of Travel Actual Path of Travel

Rear Traction Loss Correction Intended Path of Travel Actual Path of Travel Steer Toward Targeted Path of Travel Adjust Steering Input as Needed to Maintain Targeted Path of Travel Apply Light Acceleration (2 mph is goal) to Move the Weight to the Rear. (The Traction Control System will adjust the speed and brakes automatically when activated)

Off-Road Recovery Do not panic and steer too abruptly Ease off accelerator DO NOT BRAKE Get both wheels off the pavement Steer the vehicle parallel to the roadway If clear, ease back on to the roadway one wheel at a time Limit steering inputs to less than 1/8 of a turn of the wheel Use even less input when the edge of road is high

Don’t forget to take Section 5 Day 5 Quiz on Quia.com Class Work In your driver’s education book, read pages 252-256. WRITE Lesson review 1 questions (1+2) on page 256. Save these to be turned in with your test! Don’t forget to take Section 5 Day 5 Quiz on Quia.com

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