Download - TE-Road User and Vehicle Characteristic
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Road User and VehicCharacteristics
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Trafc System
Components Road users-drivers, pedestriansbicyclists, and passengers Vehicles- private and commerci
Streets and highways Trafc control devices The general environment
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our components a!ecting the trafc s
Vehicles Roads
"eneral #nvironment
$rivers
Control $evices
%edestrians
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Road Users %hysiological&'easurable and Usually(uanti)able %sychological&'uch more difcult tomeasure and *uanti+y
%sychological $esired speeds
$esired sa+ety distances %hysiological %erception-Reaction time Visual +actors
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The human response process
.bility to see Static visual acuity
$ynamic visual acuity
$epth and distance perception
"lare vision / recovery 0 1-2 sec3
Color vision
%eripheral vision 0445o V-467o83
Clearvision cone
(3-5 deg)
Fairly clear (10-12 deg)
Vision is an important +actors that a!ect almost all aspect o+ highway design asa+ety The eye is the sensory organ that enable to see and evaluate the si9e,
shape, and color o+ ob:ect and estimate distance and speed o+ movingelement;
Hearing: is an aid to identi+y
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%erception-Reaction %rocessPRT = Percepion ! Reacion
= ("eecion ! #deni$caion ! "ecision %a&in
!(Ti%e needed o iniiae 'e p'ysical response
P#RP#* = Percepion ! #nellecion#deni$caion !%oion ! Reacion (or voliion)
P#R = + (Co%ple,iy o+ 'e as&
.evel o+ e,pecancy
*aria/iliy o+ 'e drivers)
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%erception =s a process o+ perceiving the sens
received through organs;=ntellection is the identi)cation o+ stimuli by tdevelopment o+ new thoughts and which can be di!erent +rom the simrecognition by past eperience;
Time- depends on comparing the deferent ideas, regrouping and registnew sensations.
#motion is the personal behavior that governdecision ma>ing process;
Volition is the time re*uired to ta>e action;
P#* Process: