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Relationship between V/C (Volume to Capacity) Ratios and Accident Rates.

PB90142688

Publication Date	1989
Personal Author	Hall, J. W.; Pendleton, O. J.
Page Count	28
Abstract	The project sought to establish if there is a relationship between accident rates and volume to capacity ratios on rural highways. The data base for the study consisted of traffic volume data from 44 permanent count stations and traffic accident data in the vicinity of these stations. The study found that the highest accident rates occurred at nighttime during hours with the lowest traffic volumes. The sites studied in the project did not have sufficiently high traffic volumes to permit an examination of the full range of v/c ratios. Preliminary studies of several urban intersections and sections of urban freeways suggest that accident rates may begin to increase when the v/c ratios exceed 0.7. The study found that v/c ratios may be a useful safety analysis tool, especially at higher volume levels.
Keywords	Highway transportation Accident investigations Traffic safety Rural areas Regional planning Traffic engineering Vehicular traffic control Accident rates Traffic volume Traffic capacity Night driving
Source Agency	Federal Highway Administration
NTIS Subject Category	85D - Transportation Safety 85H - Road Transportation
Corporate Authors	New Mexico Univ., Albuquerque. Dept. of Civil Engineering.; Federal Highway Administration, Santa Fe, NM. New Mexico Div.; New Mexico State Highway and Transportation Dept., Santa Fe.
Supplemental Notes	Sponsored by Federal Highway Administration, Santa Fe, NM. New Mexico Div., and New Mexico State Highway and Transportation Dept., Santa Fe.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199008

Relationship between V/C (Volume to Capacity) Ratios and Accident Rates.

Relationship between V/C (Volume to Capacity) Ratios and Accident Rates.
PB90142688

Publication Date	1989
Personal Author	Hall, J. W.; Pendleton, O. J.
Page Count	28
Abstract	The project sought to establish if there is a relationship between accident rates and volume to capacity ratios on rural highways. The data base for the study consisted of traffic volume data from 44 permanent count stations and traffic accident data in the vicinity of these stations. The study found that the highest accident rates occurred at nighttime during hours with the lowest traffic volumes. The sites studied in the project did not have sufficiently high traffic volumes to permit an examination of the full range of v/c ratios. Preliminary studies of several urban intersections and sections of urban freeways suggest that accident rates may begin to increase when the v/c ratios exceed 0.7. The study found that v/c ratios may be a useful safety analysis tool, especially at higher volume levels.
Keywords	Highway transportation Accident investigations Traffic safety Rural areas Regional planning Traffic engineering Vehicular traffic control Accident rates Traffic volume Traffic capacity Night driving
Source Agency	Federal Highway Administration
NTIS Subject Category	85D - Transportation Safety 85H - Road Transportation
Corporate Authors	New Mexico Univ., Albuquerque. Dept. of Civil Engineering.; Federal Highway Administration, Santa Fe, NM. New Mexico Div.; New Mexico State Highway and Transportation Dept., Santa Fe.
Supplemental Notes	Sponsored by Federal Highway Administration, Santa Fe, NM. New Mexico Div., and New Mexico State Highway and Transportation Dept., Santa Fe.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199008