Lindsay Transportation Solutions has announced that its QuickChange® Moveable Barrier Concrete Reactive Tension System (QMB-CRTS) meets crash test and evaluation criteria contained in the American Association of State Highway and Transportation Officials’ Manual for Assessing Safety Hardware (MASH).
MASH is the new standard for the crash testing of safety devices for use on the National Highway System. It updates and replaces NCHRP Report 350.
“We are pleased to inform our existing customers that the NCHRP 350 TL-4 barrier they installed in recent years now has passed MASH TL-3,” said Chris Sanders, Senior Vice President of Lindsay Transportation Solutions. “All CRTS barriers connect seamlessly, providing fully compatible systems and spare parts.”
This robust concrete barrier is part of the Road Zipper System™ by Lindsay. The QMB-CRTS barriers consist of one-meter sections of highly reinforced concrete that are pinned together at each end to form a continuous barrier wall. The barriers have a “T” top, which acts as a lifting surface for a transfer machine. The second part of the system is a Barrier Transfer Machine (BTM), which lifts the barrier and passes it through an inverted conveyor system, transferring the barrier from 10 to 18 feet (3.0m to 5.5m) for construction applications and from 10 to 24 feet (3.0m to 7.3m) for managed lanes in one pass. The ends of the barrier are protected with a water-filled crash cushion that is also pinned together with a “T” top so that it can articulate through the transfer machine for seamless operation of the entire system. QMB-CRTS is the first and only MASH compliant moveable barrier system that utilizes a machine to create real-time roadway reconfiguration while maintaining positive barrier protections between opposing traffic lanes.
Moveable barrier systems allow agencies to reconfigure the roadway in real time, and moveable barriers are a reusable asset that can be redeployed to a different facility if traffic patterns change. Moveable barrier can be a critical, flexible element for increasing free traffic flow and reducing constriction points when mitigating congestion on existing highways or when planning for future capacity. When included in the planning stages during new highway construction, moveable barrier allows agencies to build in future flexibility, which provides unlimited options for real-time road reconfiguration.
Permanent deflection of CRTS-QMB during MASH TL-3 testing was less than one meter, which has caused some agencies to install the barrier as a protective median without a plan to move it on a regular basis. Agencies in charge of the Farrington Highway in Hawaii and the Pell Bridge in Rhode Island have installed CRTS-QMB based solely on its unanchored deflection performance. This strategy provides immediate barrier separation and containment between opposing lanes of traffic, while providing a solution for future congestion mitigation when traffic counts rise high enough to justify moving the barrier on a regular schedule.
The QMB-CRTS system completed two MASH Level 3 (TL-3) crash tests conducted by an independent testing facility, which were submitted to the Federal Highway Administration for approval in December, 2016. If installed under the range of tested conditions, QMB-CRTS is now eligible for reimbursement under the Federal-aid highway program.