7/23/2019 TE-Road User and Vehicle Characteristic

1/7

Road User and VehicCharacteristics

7/23/2019 TE-Road User and Vehicle Characteristic

2/7

Trafc System

Components Road users-drivers, pedestriansbicyclists, and passengers Vehicles- private and commerci

Streets and highways Trafc control devices The general environment

7/23/2019 TE-Road User and Vehicle Characteristic

3/7

our components a!ecting the trafc s

Vehicles Roads

"eneral #nvironment

$rivers

Control $evices

%edestrians

7/23/2019 TE-Road User and Vehicle Characteristic

4/7

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

7/23/2019 TE-Road User and Vehicle Characteristic

5/7

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

7/23/2019 TE-Road User and Vehicle Characteristic

6/7

%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)

7/23/2019 TE-Road User and Vehicle Characteristic

7/7

%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: