00464602

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http://onlinepubs.trb.org...trr/1987/1111/1111-013.pdf

https://scholar.google.co...hlen&publication_year=1987

The objective of this study was to determine the effectiveness of advisory speed signs used in conjunction with curve warning signs in Ohio. A total or 40 test drivers were used to drive an unfamiliar test route on a two-lane rural road that included two typical curves equipped with curve warning signs. Curve A was a left curve with a determined advisory speed of 40 mph and Curve C was a right curve with a determined advisory speed of 25 mph. The results of the test-driver study indicate that drivers, on the average, look about two times at a warning sign (fixation duration 0.5 to 0.6 sec). There are few consistent statistically significant differences in driver eye-scanning behavior and driver control behavior (velocity, lateral acceleration, gas pedal deflection, lane position, brake activation) between Run 1 and Run 2, between inexperienced and experienced drivers, between the presence and absence of advisory speed signs, and between day and night. The daytime velocities are in general somewhat higher than the nighttime velocities. It may be concluded that advisory speed signs are not more effective in causing drivers to reduce their speeds through curves than curve and turn signs alone. It appears that the bent black arrow in the yellow diamond of the curve or turn warning sign represents such a strong and primary visual stimulus that an advisory speed sign adds very little additional information for the driver. Therefore, it is recommended that advisory speed sign maintenance and especially new installations be given a low priority.

Publication of this paper sponsored by Committee on Vehicle User Characteristics. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

00496549

pp 110-120

1987

Transportation Research Record

0-309-04463-4

Print

Figures (4) ; References (5) ; Tables (10)

Behavior; Days; Driver performance; Drivers; Eye fixations; Highway curves; Measures of effectiveness; Night; Personnel performance; Rural highways; Speed limits; Speed signs; Testing; Traffic signs; Warning signs

Effectiveness

Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control

TRIS, TRB

Dec 31 1987 12:00AM

• A METHOD OF CALCULATING THE EFFECTIVE INTENSITY OF MULTIPLE-FLICK FLASHTUBE SIGNALS
• A STUDY OF ROUTE SELECTION FROM HIGHWAY MAPS (ABRIDGMENT)
• ALTERNATIVES TO ENFORCEMENT IN MODIFYING THE SPEEDING BEHAVIOR OF DRIVERS
• ANALYSIS OF HIGH-HAZARD LOCATIONS: IS AN EXPERT SYSTEMS APPROACH FEASIBLE?
• CRASH REVISITED: ADDITIONS TO ITS CLARITY, GENERALITY, AND UTILITY
• DEMONSTRATION OF REGRESSION ANALYSIS WITH ERROR IN THE INDEPENDENT VARIABLE
• EVALUATION OF ALTERNATIVE SIGN-LIGHTING SYSTEMS TO REDUCE OPERATING AND MAINTENANCE COSTS (DISCUSSION AND CLOSURE)
• EVALUATION OF OPPORTUNITY-BASED ACCIDENT RATE EXPRESSIONS
• EVALUATION OF THE EFFECTIVENESS OF CRASH CUSHION DELINEATION
• EXCESS TRAVEL: CAUSES, EXTENT, AND CONSEQUENCES
• RELATIONSHIPS BETWEEN VERTICAL AND HORIZONTAL ROADWAY ALIGNMENTS AND THE INCIDENCE OF FATAL ROLLOVER CRASHES IN NEW MEXICO AND GEORGIA
• SAFETY IMPLICATIONS OF TRUCK CONFIGURATION
• SPECIAL TRAFFIC CONTROL TO MEET MOTORIST INFORMATION NEEDS ON LONG, STEEP GRADES (DISCUSSION AND CLOSURE)
• STANDARD TARGET CONTRAST: A VISIBILITY PARAMETER BEYOND LUMINANCE TO EVALUATE THE QUALITY OF ROADWAY LIGHTING
• VALIDATION OF A NONAUTOMATED SPEED DATA COLLECTION METHODOLOGY
• VIDEO COLLISION RECONSTRUCTION USING PHYSICAL EVIDENCE