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原文传递 Development of a MASH TL-3 Median Barrier Gate.

题名：	Development of a MASH TL-3 Median Barrier Gate.
关键词：	development；barrier；median；mash；gate；maintenance；access；emerge；protection；ashworth
摘要：	Median barriers are commonly used to separate opposing lanes of traffic on divided highways and to separate managed lanes from general purpose lanes. Concrete median barriers (CMBs) are often preferred on urban freeways with narrow medians due to their minimal deflection and low maintenance. However, long, continuous runs of CMBs limit access of emergency and maintenance vehicles to the other side of a roadway or a managed lane. Implementation of crashworthy median barrier gates at these locations can maintain the desired level of median protection for motorists while offering improved cross-median access for emergency and/or maintenance vehicles. A new median barrier gate was developed and crash tested under this project. The gate spans a 30-ft opening in a concrete median barrier and consists of two vertically stacked 12-inch OE 12-inch OE 14-inch steel tubes connected to steel end brackets with 214-inch diameter steel pins. The gate is economical to fabricate and install. It can be manually operated by a single person and is designed to accommodate reversible traffic flow on both sides of the median and be operable in both directions on each end. The median barrier gate satisfies MASH Test Level 3 (TL-3) impact performance criteria and is considered suitable for implementation on Texas highways where cross-median access is desired.
报告类型：	科技报告