00196651

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http://onlinepubs.trb.org...s/trr/1978/685/685-006.pdf

https://scholar.google.co...ober&publication_year=1978

With the recent increase in the number of bicycles on our nations' highways and streets, there has been a corresponding increase in the number of bicycle accidents. Some of these accidents are related to highway grate inlets. The purpose of the comprehensive study summarized in this paper was to identify develop, and analyze selected grate inlets that maximize hydraulic efficiency and bicycle safety. Fifteen grate inlet designs were initially selected for consideration. They included seven steel-fabricated grates and eight cast grates. The test program was conducted using two test facilities. The bicycle safety tests were conducted on an outdoor test site consisting of a 6.7-m (22-ft wide, 152-m (500-ft) long abandoned roadway. A 2.44-m (8-ft) wide, 18.3 -m (60-ft) long hydraulic test flume was constructed in the U.S. Bureau of Reclamation, Hydraulic Research Laboratory, and used as a test facility for the hydraulic efficiency tests. The tests showed that, above certain longitudinal slopes, hydraulic efficiency was adversely affected. Also, debris-handling ability improved as the longitudinal bar spacing widened; while deterioration in bicycle safety performance began as transverse bar spacing increased above 102 mm (4 in.).

Publication of this paper sponsored by Committee on Hydrology, Hydraulics and Water Quality. 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.

01414337

pp 29-31

1978

Transportation Research Record

0309028302

Print

Figures (1) ; References (2) ; Tables (2)

Bars (Building materials); Bicycles; Economic efficiency; Grates; Hydraulics; Safety; Spacing; Surface drainage

Efficiency

Economics; Highways; Hydraulics and Hydrology; Safety and Human Factors

TRIS, TRB

Sep 15 1979 12:00AM

• COST-EFFECTIVENESS OF DRIVEWAY SLOPE IMPROVEMENTS
• DETERMINING DESIGN FLOWS FOR CULVERTS AND BRIDGES ON UNGAUGED STREAMS: A WATERSHED RATIONALE. ABRIDGMENT
• EARTH BERMS AND THEIR ACTUAL AND PERCEIVED EFFECTS ON NOISE AND PRIVACY IN ADJACENT NEIGHBORHOODS
• EDGE-OF-PAVEMENT PROFILES
• PAVEMENT WIDTH STANDARDS FOR RURAL TWO-LANE HIGHWAYS. ABRIDGMENT
• RAINFALL INTENSITY-DURATION-FREQUENCY CURVES DEVELOPED FROM (NOT BY) COMPUTER OUTPUT
• SUPERELEVATION AND CURVATURE OF HORIZONTAL CURVES