1 Oppenlander, J. C., "Variables influencing spot-speed characteristics" Highway Research Board of the National Academies 1-, 1966
2 USLIMITS, "USLIMITS2 - Office of safety - FHWA"
3 Kustom Signals, Inc., "Traffic safety radar reference manuals, version 2.2"
4 Parma, K., "Survey of speed zoning practices: An informational report" Institute of Transportation Engineers 2001
5 Currin, T. R., "Spot speed study in introduction to traffic engineering:A manual for data collection and analysis" Wadsworth Group 4-12, 2001
6 Robertson, H. D., "Spot speed studies, Manual of Transportation Engineering Studies" Prentice Hall, Inc 33-51, 1994
7 Homburger, W. S., "Spot speed studies"
8 Ottensen, J. L., "Speed-profile model for a design-consistency evaluation procedure in the united states" Transportation Research Board of the National Academies 1701 (1701): 76-85, 2000
9 Gerlough, D., "Monograph on traffic flow theory" Transportation Research Board of the National Academies 8-10, 1975
10 HCM, "Highway capacity manual"
1 Oppenlander, J. C., "Variables influencing spot-speed characteristics" Highway Research Board of the National Academies 1-, 1966
2 USLIMITS, "USLIMITS2 - Office of safety - FHWA"
3 Kustom Signals, Inc., "Traffic safety radar reference manuals, version 2.2"
4 Parma, K., "Survey of speed zoning practices: An informational report" Institute of Transportation Engineers 2001
5 Currin, T. R., "Spot speed study in introduction to traffic engineering:A manual for data collection and analysis" Wadsworth Group 4-12, 2001
6 Robertson, H. D., "Spot speed studies, Manual of Transportation Engineering Studies" Prentice Hall, Inc 33-51, 1994
7 Homburger, W. S., "Spot speed studies"
8 Ottensen, J. L., "Speed-profile model for a design-consistency evaluation procedure in the united states" Transportation Research Board of the National Academies 1701 (1701): 76-85, 2000
9 Gerlough, D., "Monograph on traffic flow theory" Transportation Research Board of the National Academies 8-10, 1975
10 HCM, "Highway capacity manual"
11 HCM, "Highway capacity manual"
12 Garber, N. J., "Factors affecting speed variance and its influence on accidents" (1213) : 64-71, 1989
13 Rowan, N. J., "A study of the effects of posted speed limits on traffic speeds" Texas A&M College 1959
14 Rowan, N. J., "A study of factors influencing traffic speeds" 30-76, 1962
15 MUTCD, "2009 edition with revisions No. 1 and 2 incorporated, Dated May 2012, p. 58"
16 MUTCD, "2009 edition with revisions No. 1 and 2 incorporated, Dated May 2012, p. 56"