glare and night time driving

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Page 1: Glare and Night Time Driving

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GLARE & NIGHT TIMEDRIVING

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GLARE…

Harsh uncomfortably bright light.

It’s a sensation in response to light that can

take a number of forms.

Results from bright, steady, dazzling light or

from shiny surfaces.Can also caused by very bright foreground.

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GLARE…

Or by light reflected by fog or sno.

!lare affects both day " night driving

 performance.

#ffects of glare on drivers are classified

  $%iscomfort glare

  $%isability glare

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Disability Glare

&lso knon as physiological glare.

Created by bright light.

Its comes from light scattering in the occular

media.

Reduce driver’s ability to perform visual task.

!laring light scattered in the eye can be

e'pressed as superposition of uniform

luminance onto retinal ima e.

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Discomfort Glare

Bright light

Cause discomfort or annoyance

Scale of discomfort glare was used by DeBoer.

Inuenced by 3 factors

  -location of glare source

  -luminance of background

  -luminance & sie of glare source

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Causes of Headlight Glare

Illumination from the glare source

!lare angle

Back ground luminance

Sie of the glare source

!lare source luminance

Dri"er age

#eecti"e surfaces

!lare from mirrors

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GLARE O !"O LAEH#GH"A$%..$ower $ight le"els

%ncoming trac closer to dri"er's line of sight

Com(le) #oadway geometry

$ess restricted roadway access

$ess roadway markings

Closer (ro)imity of (edestrians

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Lo&er Light Le'els

(isibility of an ob*ect depends on overall

light levels

+ole mounted roaday lighting help to

see on unlighted roads

(isibility depends on the contrast of anob*ect against its background

!lare reduce visibility

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O(comi(g traffic closer todri'er)s li(e of sight

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Com*le+ Road&ayGeometry

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LE%% RE%!R#C!EDROAD"A$ ACCE%%%iscomfort from headlamp glare increases

hen visual task is more difficult

Chances for hazard along a to lane highay

is greater 

(ehicles enter from variety of locations anddirections

 ot restricted for bicycle travel or pedestrian

use

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,e&er road&ay mar-i(gs

)ulti$lane highays are marked ith

indications for traffic lanes

-o$lane highays may not have median

lines or nor markings

Roaday markings facilitate efficient " safedriving

 o direct impact on driver 

+rovide visual uidance to a driver 

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CLO%ER PRO#M#!$ O,PEDE%!R#A%%n two lane highways (edestrians more

closer to "ehicle trac

$ess common on highways but are notrestricted

*edestrians themsel"es are not always easily

seenDark cloths ha"e less reectance

Do not (ro"ide much contrast against the

roadway (a"ement

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CO/!ERMEA%/RE% !OCO!ROL GLARE 

$y reducing the illumination

  $y increasing glare angle

  $Indirect measures

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• -hree types$type1,type2,type3

• -ype1$continous and block light from all

angles

• #g4 earth mounds and concrete barriers

• -ype2$continous screen of an open materialopa5ue to light coming from angle of 6$26

degrees

• -rans arent for be ond 26 de rees

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#g4 e'panded metal mesh, knit polyester

fabric and fencing

-ype3$ made up of individual elements that

 block light from angles of zero to 26 degrees

+rovide clear visibility beyond 26 degrees)anufactured by individually supported

 paddles at intervals

 

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#%+DSID, *$++I%

• !lare can be controlled by planting trees or

 bushes in the median

• +osition of trees should be fi'ed

• 0hould be sufficiently aay from carriage ay

• -ree guard should be prepared to protect the

young sapling

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+revent glare from sunlight as ell as from

vehicle headlamps

*%$+#I/,D $I!0I!

Ordinary light consists of electromagnetic

aves hich vibrate in all directions7hen passes through polarizing filter light

aves are absorbed

ecome linearl olarized

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Can improve visibility by decreasing the

amount of light from oncoming headlights.

oth vehicles should be e5uipped ith the

 proper hardare

0hould have a polarizer and analyser or polarizing filter 

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!o i(crease the glare a(gle

IC#,+S, 2,DI+ ID0

&&0H-O refers median as a portion of

divided highay separating the travelled

ay for traffic in opposing directions

+rovide recovery area for out$of$controlvehicles

+rovide stopping area

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)ay be depressed or raised

Increasing median idth decreases the effects

of glare from opposing headlights

Increasing lateral separation shifts the beam

 pattern of the opposing vehicle and results inloer intensities of light

Reduce both disability and glare

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ID,*,D, +$I!2,

-hose ith horizontal and vertical alignment

+laces each roaday at a different elevation

8sed here there is large median idth

#liminates glare entirely

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#(direct measures toreduce effects of glare4$#+1I%$, 0,+D$I!0S

#educe glare on highways by reducing the

need of "isible light

Im(ro"e night time "isibility of (edestrians5lane lines5 signs and other ob6ects

41 radiations when absorbed get con"ertedto longer wa"e length "isible light-7$4%#,SC,C,

It makes ob6ects more easily seen

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7I8,D #%+D+9 $I!0I!

Designed according to 3 methods

  -illuminance

-(a"ement luminance

  -"isibility#educe night time accidents

Im(ro"e (edestrians safety

2iti ate the e:ect of lare

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COCL/%#O

ot (ossible to recommend one countermeasure that would eliminate discomfort glarefor e"eryone in all situations.

 !lare at night can be mitigated by designchanges in roadway5 automobiles5 and"ehicles lighting systems and thus im(ro"e

night "ision on highways.

o of counter measures can be im(lementedwith minimal cost for glare reduction

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RE,ERECE%

Avijit Ghosh, Bagui S.K., & Jha S.K. 9266:; <highay

design considering glare=, Indian highways, vol.33,

no.12.pp. %ecember 266:.

Ambarish Ghosh & Swapan Kumar <visual systems

and glare=, Indian highways, &ugust 266>.

Adrain W, <& method for %esign of -unnel #ntrance

/ighting=, Journal Roads and Streets, pp.12?$133.

Duncan,D.D. 91>>@;, <ighttime glare Reduction and

Illumination #nhancement =, Report No. FS-96-037,

 Johns op!ins "pplied #hysi$s %a&oratory, Fleet syste's

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THANK YOU...