3. Rollover Prevention
Our unified cause for keeping the roadways and highways safe is the
application of educating those that transport our many commodities
through and across the united states. With out this unified effort to
educate quality driving habits to prevent accidents and rollovers our
ability to have Safety First is diminished and lives are at risk.
4. Potential Causes of Rollovers
Excessive Speed
Liquid Movement
Erratic maneuver
Lack of education in good,
Safe and defensive driving
habits.
Being in a hurry
Maintenance issues
Weather and road conditions
5. Here are some facts to
ponder
Vehicle Stability Depends on these factors
Center of Gravity
Distance Between Wheels
Liquid Movement
Speed change / Serge / Momentum
6. Centrifugal Force or CF
Is the force working sideways on a moving
vehicle
Increases by the square of the speed
double the speed = 2 squared (4) X the CF
3 X the Speed = 3 squared (9) X the CF
7. Four Major Factors Contribute to a Rollover
High Center of Gravity
Radius of Curve
Slope of the Roadway
Speed of the vehicle
8.
9. High Center of Gravity
The higher the Center of Gravity of a
vehicle and its load, the easier it is for the
force of gravity to move outside the foot
print of the vehicle that is traveling at the
speed that will be the causal factor for the
rollover to take place.
10. Seeing and recalling situations in the passed that I
was involved in as an investigator always came up
with stifling proof that these factors along with
others were the underlying factors that contributed
to the situation.
1. Speed
2. Being hurried for a signal light while turning or Lane
change at intersection or Highway.
3. Liquid load serge
4. Other outside factors (A motorist)
5. Alcohol / Drugs
11. Potential of life that can be lost, property
damage can cost thousands, Insurance costs go
up, customers and potential customers can be
lost.
12. Radius of Curve
The shorter or “tighter” the radius of
curve, the greater the side force to “pull”
the trailer over! “ROLLOVER”
13. Slope of the Roadway
The greater the slope or “crown” of the
roadway the easier it is for the force of
gravity to be outside the foot print of the
vehicle “ROLLOVER”
14. Speed
Most influential factor
Centrifugal Force increase in an amount
equal to the square of the vehicle’s speed
Results in decreased driver response time
15. Driver Control
High Center of Gravity None
Radius of Curve Route
selection
Slope of Roadway Route selection
Speed Significant
16. Driver’s Guidelines: Turns & Curves
Posted Curves
On sharp, curved roadways the safe speed
for tractor-trailers is 10 MPH below the
posted warning entry or exit speed limits.
17. Driver’s Guidelines: Turns & Curves
Unmarked Curves
On sharp, curved roadways which are not-posted,
the safe speed for tractor-trailers is 10 MPH !
18. Speed Cushion
As the SPACE cushion is the separation in
distance between vehicles, the SPEED
cushion is the separation in MPH between
ROLLOVER speed and a safe maneuvering
speed within a curve.
19. Unsafe Maneuvering
Sudden evasive maneuvers have a high
potential for rollover. Hard braking and
sudden turning to avoid an obstacle or
small car has resulted in numerous
rollovers.
20. Unsafe Maneuvering
Side to side lane changes cause the liquid
movement to ”come into phase” with the
vehicle movement. This results in a lower
rollover speed.
21. Defensive Driving Principles
Aim High in Your Steering
Get the Big Picture
Keep Your Eyes Moving
Leave Yourself an Out
Make Sure They See You
25. Being in a Hurry!
Signal Lights
Off Ramps
On Ramps
Lane Changes
Narrow Road Travel
26. What is our answer to this
education we have just seen?
Slow down
Be a smart cautious driver
Be educated on the latest techniques
of defensive driving (Smith System)
Ask for help and broadcast it if others
need help.
