PDA
perceive
decide
act
IPDE
identify
predict
decide
execute
SIPDE
search
identify
predict
decide
execute
SEE
search
evaluate
execute
central vision
3% of drivers total view
fringe vision
judges depth and position
peripheral vision
detects presence of color and motion
visual lead time
20-30 seconds
visual control zone time
12-15 seconds
smoothly respond and react
what are objects along the roadside that can limit your line of sight and field of view?
trees, buildings, hills
components of a selective search pattern
- directing your search; know where to look, when and for what
- classifying information; organize
factors of directing your search
- searching for important factors
- gathering information
- line of sight changes
- ground viewing
- offroad obstacles
- traffic conditions
- adjusting to visibility changes
- daylight hours (sunglasses)
- night driving
- driving at dusk
- inclement weather
-headlights - lights on laws
- keep it clean
decision factors
what
when
where
how
factors to consider when selecting the best path of travel are
lane markings
alternate path
roadway conditions
off road conditions
traffic conditions
behavior of other drivers
three lane positions
1- center
2- closer to left side of lane
3- closer to right side of lane
perception time and reaction time
0.5 to 0.75 second
4 second rule
your vehicle reached a certain landmark or point 4 seconds after the car in front of you reaches that point
- purpose is to have enough time to react and reduce risk
- if there are bad weather conditions, make it 5 seconds
areas with reduced space sign tells us that
- the highway lanes may narrow from 4 to 3
- the width of a two lane road decreases from 24 ft to 18 ft
how to deal with tailgating
- use lane positions 2 or 3 (move to either side of the lane)
- pull into the shoulder and let them pass
closing probability
the chance that a vehicle and another road user will move closer together as they move along projected paths of travel
closing actions
maneuvers drivers make that increase closing probability
5 traffic conflict situations
- oncoming vehicles
- merging and exiting vehicles
- cars ahead of you
- vehicles behind you
- intersecting vehicles and pedestrians
anticipating errors
- vision and perception errors
- failing to yield right of way
- improperly adjusting speed
- poorly judging distance or space requirements
- inadequate or improper vehicle control
- improper signaling
