Short Haul Vehicle bridge evaluation deadline only one year away
With new technology building smaller freight trucks capable of carrying heavier loads, it’s essential for roads and bridges to withstand more concentrated amounts of pressure. This is the case with Specialized Hauling Vehicles, also known as Short Haul Vehicles.
Introduced at the turn of the millennium, SHVs are closely-spaced, multi-axle, single-unit trucks. You see these every day – construction vehicles, dump trucks and solid waste trucks are all types of SHVs that have made short-distance hauls easier. However, concentrating heavy loads onto a smaller vehicle sometimes creates over-stress situations on roadway infrastructure, particularly on bridges.
In 2013, the Federal Highway Administration released a statement requiring all state Departments of Transportation to re-evaluate their bridges in order to determine if they are safe for SHVs. This is to be done in two parts:
- Bridges shorter than 200 feet should be re-evaluated for SHV use before December 31, 2017
- Bridges longer than 200 feet should be re-evaluated for SHV use before December 31, 2022
Evaluating every bridge in the state is time-consuming and costly. To combat this problem, the FHWA created a system that allows states to quickly determine which bridges need to be re-evaluated. Each bridge should already have an AASHTO Notional Rating Load rating factor. State DOTs can filter out the bridge structures that have an AASHTO NRL greater than or equal to 1.0 either at the inventory rating level or operating rating level. Any structure with an NRL below 1.0 needs to be evaluated for SVHs.
For example, here in Wisconsin, WisDOT owns 5,242 bridges while 8,817 bridges are owned by local agencies. After checking each bridge’s AASHTO NRL rating, only 259 state-owned bridges and 1,838 locally-owned bridges require additional evaluation.
At this moment, the only requirement is that bridge owners post the maximum load bearing weight at the bridge to alert SHV drivers whether the bridge is safe to cross. The ultimate goal of this evaluation inventory is to make all bridges safer and more structurally sound for these new, more compact vehicles. Once a bridge is ready to be replaced or rehabilitated, the state bridge owner will include the new SHV NRL load rating specifications in their designs.
How far along are you with the bridge evaluation process in your state? If you’re behind and need an extra hand, Mead & Hunt employs a number of licensed structural engineers and licensed professional engineers who are certified NBIS bridge inspectors. Let us know how we can assist you in meeting this important FHWA deadline.
About the Author
Darrell Berry, PE, SE, F-ASCE-Life has extensive experience in developing and delivering transportation projects in accordance with state and federal policies and procedures. He is also a certified value engineer with extensive work in infrastructure and structural engineering designs and inspections for highway and railroad bridges.
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