ATSSA TRAFFIC CONTROL
SUPERVISOR RE-CERTIFICATION
(MISSING SOME BASICS)
L=(WS²)/600for040MPH0or0less,
L=WS0for045MPH0or0more0-0answer--Formula0for0Min.0taper0length
The0off0peak085th0percentile.0Which0is0the0speed0at0or0below0which085%0of0vehicles0t
ravel0operating0speed0in0free0flow0conditions0-0answer--
speed0used0in0formulas0should0be
125'0-0answer--Distance0of0L0for0250MPH0with012'0Lane0width
245'0-0answer--Distance0of0L0for0350MPH0with012'0Lane0width
540'0-0answer--Distance0of0L0for0450MPH0with012'0Lane0width
660'0-0answer--Distance0of0L0for0550MPH0with012'0Lane0width
780'0-0answer--Distance0of0L0for0650MPH012'0Lane0width
L0Minimum0-0answer--Merging0Taper0Length
1/20L0Minimum0-0answer--Shifting0Taper0Length
1/30L0Minimum0-0answer--Shoulder0Taper0Length
50'-100'0regardless0of0speed
60devices010'-20'0apart0-0answer--One-Lane,0Two-
Way0Taper0(Flagger0taper)0Length0and0number0of0devices
50'-100'0per0lane0-0answer--Downstream0taper0Length
2L0-0answer--Tangent0distance0(between0tapers)
1/2L0-0answer--Tangent0distance0before0shifting0taper
, Buffer0Space
Work0Space
Traffic0Space0-0answer--Activity0Area0Sub-components0(3)
Recovery0Area0for0errant0vehicles:0Forgiving0design
Protects0workers0and0Motorists
Always0completely0empty0or0clear
No0vehicles,0truck-mounted0attenuator,0equipment,0or0materials
STRONGLY0RECOMMENDED:0unless0there0is0a0documented0reason0not0to0-
0answer--Longitudinal0Buffer0Space
Where0road0users0are0returned0to0their0normal0path
extends0from0the0downstream0end0of0the0work0area0to0the0last0device0such0as0end0w
ork0zone0sign
May0contain:
end0work0zone0sign:0usually0500'0past0last0device
downstream0taper0=050'-100'0per0lane0-0answer--Termination0Area0is:
can0contain:0(2)
100'0-0answer--Recommended0Advanced0Warning0Sign0Spaceing:0Urban0(low0speed)
350'0-0answer--Recommended0Advanced0Warning0Sign0Spaceing:0urban0(high0speed)
500'0-0answer--Recommended0Advanced0Warning0Sign0Spaceing:0Rural
1000',01500',0and02640'0-0answer--
Recommended0Advanced0Warning0Sign0Spaceing:0freeways0and0expressways0(3)
10Mile
50%
shoulder0at0beginning0of0taper0if0possible,0if0not,0as0close0to0beginning0as0possible0ins
ide0taper.0-0answer--Arrow0board0visibility0distance0by0design:
night0time0dimming:
location:
taper:0not0to0exceed0distance0in0feet0=0to0posted0speed0limit
tangent:0distance0=0double0posted0speed0limit0-0answer--device0spacing0taper:
tangent:
A:0Low0intensity0flashing
B:0High-intensity0flashing
C:0Steady0Burn
D:0360°0steady0burn0-0answer--Warning0lights0types:
Type0A:
SUPERVISOR RE-CERTIFICATION
(MISSING SOME BASICS)
L=(WS²)/600for040MPH0or0less,
L=WS0for045MPH0or0more0-0answer--Formula0for0Min.0taper0length
The0off0peak085th0percentile.0Which0is0the0speed0at0or0below0which085%0of0vehicles0t
ravel0operating0speed0in0free0flow0conditions0-0answer--
speed0used0in0formulas0should0be
125'0-0answer--Distance0of0L0for0250MPH0with012'0Lane0width
245'0-0answer--Distance0of0L0for0350MPH0with012'0Lane0width
540'0-0answer--Distance0of0L0for0450MPH0with012'0Lane0width
660'0-0answer--Distance0of0L0for0550MPH0with012'0Lane0width
780'0-0answer--Distance0of0L0for0650MPH012'0Lane0width
L0Minimum0-0answer--Merging0Taper0Length
1/20L0Minimum0-0answer--Shifting0Taper0Length
1/30L0Minimum0-0answer--Shoulder0Taper0Length
50'-100'0regardless0of0speed
60devices010'-20'0apart0-0answer--One-Lane,0Two-
Way0Taper0(Flagger0taper)0Length0and0number0of0devices
50'-100'0per0lane0-0answer--Downstream0taper0Length
2L0-0answer--Tangent0distance0(between0tapers)
1/2L0-0answer--Tangent0distance0before0shifting0taper
, Buffer0Space
Work0Space
Traffic0Space0-0answer--Activity0Area0Sub-components0(3)
Recovery0Area0for0errant0vehicles:0Forgiving0design
Protects0workers0and0Motorists
Always0completely0empty0or0clear
No0vehicles,0truck-mounted0attenuator,0equipment,0or0materials
STRONGLY0RECOMMENDED:0unless0there0is0a0documented0reason0not0to0-
0answer--Longitudinal0Buffer0Space
Where0road0users0are0returned0to0their0normal0path
extends0from0the0downstream0end0of0the0work0area0to0the0last0device0such0as0end0w
ork0zone0sign
May0contain:
end0work0zone0sign:0usually0500'0past0last0device
downstream0taper0=050'-100'0per0lane0-0answer--Termination0Area0is:
can0contain:0(2)
100'0-0answer--Recommended0Advanced0Warning0Sign0Spaceing:0Urban0(low0speed)
350'0-0answer--Recommended0Advanced0Warning0Sign0Spaceing:0urban0(high0speed)
500'0-0answer--Recommended0Advanced0Warning0Sign0Spaceing:0Rural
1000',01500',0and02640'0-0answer--
Recommended0Advanced0Warning0Sign0Spaceing:0freeways0and0expressways0(3)
10Mile
50%
shoulder0at0beginning0of0taper0if0possible,0if0not,0as0close0to0beginning0as0possible0ins
ide0taper.0-0answer--Arrow0board0visibility0distance0by0design:
night0time0dimming:
location:
taper:0not0to0exceed0distance0in0feet0=0to0posted0speed0limit
tangent:0distance0=0double0posted0speed0limit0-0answer--device0spacing0taper:
tangent:
A:0Low0intensity0flashing
B:0High-intensity0flashing
C:0Steady0Burn
D:0360°0steady0burn0-0answer--Warning0lights0types:
Type0A:
