glare and night time driving
TRANSCRIPT
8/18/2019 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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