ATSSA TRAFFIC CONTROL
SUPERVISOR CERTIFICATION EXAM
WITH THE CORRECT ANSWERS
L=(WS²)/60 nfor n40MPH nor nless,
L=WS nfor n45MPH nor nmore n- n ncorrect nanswer- nFormula nfor nMin. ntaper nlength
The noff npeak n85th npercentile. nWhich nis nthe nspeed nat nor nbelow nwhich n85% nof
nvehicles ntravel noperating nspeed nin nfree nflow nconditions n- n ncorrect nanswer-
nspeed nused nin nformulas nshould nbe
125' n- n ncorrect nanswer- nDistance nof nL nfor n25 nMPH nwith n12' nLane nwidth
245' n- n ncorrect nanswer- nDistance nof nL nfor n35 nMPH nwith n12' nLane nwidth
540' n- n ncorrect nanswer- nDistance nof nL nfor n45 nMPH nwith n12' nLane nwidth
660' n- n ncorrect nanswer- nDistance nof nL nfor n55 nMPH nwith n12' nLane nwidth
780' n- n ncorrect nanswer- nDistance nof nL nfor n65 nMPH n12' nLane nwidth
L nMinimum n- n ncorrect nanswer- nMerging nTaper nLength
1/2 nL nMinimum n- n ncorrect nanswer- nShifting nTaper nLength
1/3 nL nMinimum n- n ncorrect nanswer- nShoulder nTaper nLength
50'-100' nregardless nof nspeed
6 ndevices n10'-20' napart n- n ncorrect nanswer- nOne-Lane, nTwo-Way nTaper n(Flagger
ntaper) nLength nand nnumber nof ndevices
, 50'-100' nper nlane n- n ncorrect nanswer- nDownstream ntaper nLength
2L n- n ncorrect nanswer- nTangent ndistance n(between ntapers)
1/2L n- n ncorrect nanswer- nTangent ndistance nbefore nshifting ntaper
Buffer nSpace
Work nSpace
Traffic nSpace n- n ncorrect nanswer- nActivity nArea nSub-components n(3)
Recovery nArea nfor nerrant nvehicles: nForgiving ndesign
Protects nworkers nand nMotorists
Always ncompletely nempty nor nclear
No nvehicles, ntruck-mounted nattenuator, nequipment, nor nmaterials
STRONGLY nRECOMMENDED: nunless nthere nis na ndocumented nreason nnot nto n- n
ncorrect nanswer- nLongitudinal nBuffer nSpace
Where nroad nusers nare nreturned nto ntheir nnormal npath
extends nfrom nthe ndownstream nend nof nthe nwork narea nto nthe nlast ndevice nsuch
nas nend nwork nzone nsign
May ncontain:
end nwork nzone nsign: nusually n500' npast nlast ndevice
downstream ntaper n= n50'-100' nper nlane n- n ncorrect nanswer- nTermination nArea nis:
can ncontain: n(2)
100' n- n ncorrect nanswer- nRecommended nAdvanced nWarning nSign nSpaceing:
nUrban n(low nspeed)
350' n- n ncorrect nanswer- nRecommended nAdvanced nWarning nSign nSpaceing:
nurban n(high nspeed)
500' n- n ncorrect nanswer- nRecommended nAdvanced nWarning nSign nSpaceing:
nRural
1000', n1500', nand n2640' n- n ncorrect nanswer- nRecommended nAdvanced nWarning
nSign nSpaceing: nfreeways nand nexpressways n(3)
1 nMile
50%
shoulder nat nbeginning nof ntaper nif npossible, nif nnot, nas nclose nto nbeginning nas
npossible ninside ntaper. n- n ncorrect nanswer- nArrow nboard nvisibility ndistance nby
ndesign:
night ntime ndimming:
location:
taper: nnot nto nexceed ndistance nin nfeet n= nto nposted nspeed nlimit
tangent: ndistance n= ndouble nposted nspeed nlimit n- n ncorrect nanswer- ndevice
nspacing ntaper:
tangent:
SUPERVISOR CERTIFICATION EXAM
WITH THE CORRECT ANSWERS
L=(WS²)/60 nfor n40MPH nor nless,
L=WS nfor n45MPH nor nmore n- n ncorrect nanswer- nFormula nfor nMin. ntaper nlength
The noff npeak n85th npercentile. nWhich nis nthe nspeed nat nor nbelow nwhich n85% nof
nvehicles ntravel noperating nspeed nin nfree nflow nconditions n- n ncorrect nanswer-
nspeed nused nin nformulas nshould nbe
125' n- n ncorrect nanswer- nDistance nof nL nfor n25 nMPH nwith n12' nLane nwidth
245' n- n ncorrect nanswer- nDistance nof nL nfor n35 nMPH nwith n12' nLane nwidth
540' n- n ncorrect nanswer- nDistance nof nL nfor n45 nMPH nwith n12' nLane nwidth
660' n- n ncorrect nanswer- nDistance nof nL nfor n55 nMPH nwith n12' nLane nwidth
780' n- n ncorrect nanswer- nDistance nof nL nfor n65 nMPH n12' nLane nwidth
L nMinimum n- n ncorrect nanswer- nMerging nTaper nLength
1/2 nL nMinimum n- n ncorrect nanswer- nShifting nTaper nLength
1/3 nL nMinimum n- n ncorrect nanswer- nShoulder nTaper nLength
50'-100' nregardless nof nspeed
6 ndevices n10'-20' napart n- n ncorrect nanswer- nOne-Lane, nTwo-Way nTaper n(Flagger
ntaper) nLength nand nnumber nof ndevices
, 50'-100' nper nlane n- n ncorrect nanswer- nDownstream ntaper nLength
2L n- n ncorrect nanswer- nTangent ndistance n(between ntapers)
1/2L n- n ncorrect nanswer- nTangent ndistance nbefore nshifting ntaper
Buffer nSpace
Work nSpace
Traffic nSpace n- n ncorrect nanswer- nActivity nArea nSub-components n(3)
Recovery nArea nfor nerrant nvehicles: nForgiving ndesign
Protects nworkers nand nMotorists
Always ncompletely nempty nor nclear
No nvehicles, ntruck-mounted nattenuator, nequipment, nor nmaterials
STRONGLY nRECOMMENDED: nunless nthere nis na ndocumented nreason nnot nto n- n
ncorrect nanswer- nLongitudinal nBuffer nSpace
Where nroad nusers nare nreturned nto ntheir nnormal npath
extends nfrom nthe ndownstream nend nof nthe nwork narea nto nthe nlast ndevice nsuch
nas nend nwork nzone nsign
May ncontain:
end nwork nzone nsign: nusually n500' npast nlast ndevice
downstream ntaper n= n50'-100' nper nlane n- n ncorrect nanswer- nTermination nArea nis:
can ncontain: n(2)
100' n- n ncorrect nanswer- nRecommended nAdvanced nWarning nSign nSpaceing:
nUrban n(low nspeed)
350' n- n ncorrect nanswer- nRecommended nAdvanced nWarning nSign nSpaceing:
nurban n(high nspeed)
500' n- n ncorrect nanswer- nRecommended nAdvanced nWarning nSign nSpaceing:
nRural
1000', n1500', nand n2640' n- n ncorrect nanswer- nRecommended nAdvanced nWarning
nSign nSpaceing: nfreeways nand nexpressways n(3)
1 nMile
50%
shoulder nat nbeginning nof ntaper nif npossible, nif nnot, nas nclose nto nbeginning nas
npossible ninside ntaper. n- n ncorrect nanswer- nArrow nboard nvisibility ndistance nby
ndesign:
night ntime ndimming:
location:
taper: nnot nto nexceed ndistance nin nfeet n= nto nposted nspeed nlimit
tangent: ndistance n= ndouble nposted nspeed nlimit n- n ncorrect nanswer- ndevice
nspacing ntaper:
tangent:
