00818864

Component

https://doi.org/10.3141/1751-08

http://scholar.google.com...Huff&publication_year=2001

Since the repeal of the National Maximum Speed Limit by the U.S. Congress, individual states have been modifying existing speed limits on state and federal highways. Increases in speed limits have caused the inferred design speeds of many crest vertical curves along two-lane rural highways to be less than the posted and operating speeds according to accepted national guidelines. Past research has found that rate of curvature and inferred design speed can be used to predict operating speeds on crest vertical curves. Crest vertical curve, roadway, traffic, and speed characteristic data are included to determine the features that influence the speeds on crest vertical curves. Speed data were collected on 70 crest vertical curves across Nebraska. Multiple linear regressions were included to determine the crest vertical curve, roadway, traffic and speed characteristics that affect speeds on crest vertical curves. The posted speed of the highway was found to have the most influence on the operating speed. The inferred design speed of the vertical curves was not a significant factor.

This paper appears in Transportation Research Record No. 1751, Geometric Design and the Effects on Traffic Operations 2001.

English

p. 67-75

2001

Transportation Research Record

0309072123

Figures (2) ; References (10) ; Tables (8)

Curvature; Design speed; Field studies; Mathematical prediction; Multiple regression analysis; Operating speed; Rural highways; Speed limits; Two lane highways

Vertical curvature

Nebraska

Data and Information Technology; Design; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure

TRIS, TRB, ATRI

Oct 18 2001 12:00AM

• APPLICATION OF ARTIFICIAL NEURAL NETWORKS TO PREDICT SPEEDS ON TWO-LANE RURAL HIGHWAYS
• CONTROLS FOR HORIZONTAL CURVE DESIGN
• DESIGN FACTORS THAT AFFECT DRIVER SPEED ON SUBURBAN STREETS
• GEOMETRIC DESIGN AND SAFETY ASPECTS OF ROUNDABOUTS
• GUIDELINES FOR OPPOSING LEFT-TURN LANE-LINE WIDTHS
• OPERATIONAL EVALUATION OF FREEWAY RAMP DESIGN
• SAFETY EFFECT OF ROUNDABOUT CONVERSIONS IN THE UNITED STATES: EMPIRICAL BAYES OBSERVATIONAL BEFORE-AFTER STUDY
• SPEED BEHAVIOR ANALYSIS AT CURVED RAMP SECTIONS OF MINOR INTERCHANGES
• SPEED PREDICTION MODELS FOR TRUCKS ON TWO-LANE RURAL HIGHWAYS
• TRAVEL TIME COMPARISONS BETWEEN SEVEN UNCONVENTIONAL ARTERIAL INTERSECTION DESIGNS