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Accelerated bridge construction (ABC) helps crews complete bridge repairs and replacements faster. These methods can reduce traffic disruptions while maintaining safety and quality.
- ABC projects typically combine detailed pre-construction planning, offsite prefabrication, strategic traffic control and rapid onsite installation.
- Key benefits include shorter construction timelines, fewer road closures, improved worker and driver safety and reduced long-term maintenance disruptions.
- Northern Construction used ABC techniques to replace two Route 24 bridges in Randolph, Massachusetts.
Traditional bridge replacement can take months or years, causing road closures and traffic changes that frustrate drivers. To streamline the process, many transportation agencies and road construction crews have adopted accelerated bridge construction (ABC).
ABC allows bridge crews to replace bridges faster, often in days, while meeting the same safety and compliance standards as traditional construction. Learn more about accelerated bridge construction and how Northern Construction has successfully leveraged these methods.
What Is ABC?
Accelerated bridge construction uses innovative techniques to reduce the time needed to build, replace or repair bridges. It’s also called rapid bridge replacement (RBR). One of ABC’s biggest advantages is that it lowers the inconveniences and risks that traditional bridge construction projects pose to drivers, work crews and transportation authorities.
ABC processes vary, but they often include a variety of common practices. These include:
- Thorough pre-construction planning to help crews coordinate timelines for existing bridge demolition and new construction
- Offsite prefabrication of bridge components, which are then transported to the job site for rapid installation.
- Strategic traffic management and road closures to minimize the impact on travelers during the replacement.
ABC is safe, efficient, cost-effective and does not threaten the integrity of the new bridge infrastructure. It offers advantages for transportation agencies, bridge crews and drivers, including:
- Reduced road closures and traffic congestion
- Shortened project schedules
- Reduced impact on surrounding communities
- Lower cost risks
- Improved worker and driver safety
In other words, ABC helps replacement work move faster, reopening the bridge to traffic sooner and creating a more convenient experience for everyone.
How Can Crews Replace a Bridge Using ABC?
Northern Construction has deep expertise in ABC workflows, which we leverage to help projects run more smoothly. Here’s how the process typically works.
1. Pre-Construction Planning and Sequencing
Before any ABC bridge project begins, extensive project planning occurs. Northern Construction’s pre-construction protocols typically involve:
- Developing detailed sequencing plans
- Formulating precise engineering, design and construction procedures
- Conducting full rehearsals, dry runs and pre-placement meetings
- Maintaining contingency plans for weather, equipment and traffic issues
- Constructability reviews to evaluate and verify the project’s design
- Advance material procurement and staging
- Utility coordination and risk management for water, gas, electricity, telecommunications, etc.
Cooperation among contractors, fabricators, inspectors and traffic teams is critical during the pre-planning phase. Covering as many bases as possible before construction begins helps reduce the likelihood of project interruptions and delays.
2. Offsite Prefabrication
A core component of ABC is the offsite fabrication. Where possible, bridge superstructure and substructure components are manufactured, and prepared at a different location. Then, they are transported to the new site for rapid installation.
Offsite fabrication allows much of the construction to be completed before closing any roadways. Therefore, traffic disruption times are shortened, and there’s less actual work that needs to be done in the field.
3. Traffic Control and Weekend Closures
Once pre-fabricated units arrive at the bridge site, ABC can help ease traffic inconveniences. Northern Construction uses various tactics to minimize commuter disruptions:
- Public outreach and coordination help notify travelers of closures or detours in advance.
- Closures are scheduled during nights and weekends, allowing construction to occur during low-traffic periods.
- Temporary traffic crossovers and detours maintain steady movement during work.
4. Demolition and Efficient Installation
Once the pre-fabricated bridge components arrive at the jobsite, ABC procedures help ensure efficient installation.
- Any pre-installation work, demolition and site clearance occurs on a coordinated timeline to prepare the space for the new bridge components.
- The new pieces are efficiently fitted into place and connected using appropriate construction techniques.
Crews will work around the clock and in sync to ensure work progresses smoothly. Contingency plans will remain in place to mitigate any unforeseen circumstances.
5. Final Safety Checks and Reopening
Once the installation is complete, a full safety and compliance inspection assesses the new bridge structure’s integrity. The bridge can then reopen to traffic. Additional finishing work may continue after opening, but most construction will be completed.
Benefits of Accelerated Bridge Construction
ABC benefits road crews, motorists and local transportation authorities in multiple ways.
- Shortened construction timelines allow bridges to be completed in a few days or weeks. It’s now possible to have a new bridge—and a safer roadway—reopened sooner.
- The bridge replacement process has less of an impact on normal traffic flow. Commuters won’t face months of traffic jams, road closures and detours.
- Drivers will face fewer construction zone accident risks, both because of the shortened timeline and because there is less work being done onsite.
- Work crews face fewer injury risks from jobsite hazards and oncoming vehicles.
- Offsite prefabrication can better ensure product quality. Products are manufactured efficiently and with proper oversight in a controlled environment.
Through the more streamlined ABC process, safe, fully operational bridges are able to reopen to the public sooner, better ensuring roadways continue to function optimally for drivers.
Real-World ABC Example: Route 24 Bridge Replacements
Northern Construction has used accelerated bridge construction practices across multiple projects. A prime example is our recent double bridge replacement along Route 24 in Randolph, Massachusetts.
ABC and the Randolph Bridge Project
Route 24 connects the South Shore of Massachusetts with Boston, handling about 135,000 vehicles daily. The Massachusetts Department of Transportation (MassDOT) hired Northern Construction to replace the highway’s northbound and southbound bridges over Canton Street in Randolph.
The new Route 24 bridges had to open on time and with minimal commuter inconveniences. Northern Construction replaced both bridges in two weekends in April and May 2024, leveraging multiple ABC techniques, including:
- Thorough pre-construction planning to minimize contingencies
- Utilizing prefabricated bridge elements
- Scheduling closures on Friday evening and reopenings on Monday morning
- Setting up temporary crossovers to maintain travel in each direction
- Reopening the superstructure while continuing minor finishing work
Up to 80 skilled workers worked continuously throughout the closure and replacement. Pre-construction rehearsals and coordination helped the project move forward smoothly and safely. Both Route 24 bridges reopened on schedule, and due to our accelerated Friday-to-Monday timelines, we reduced travel interruptions for area commuters.
Learn more about the Randolph bridge replacements project in our case study.
When Faster Bridge Replacement Is Essential, Trust ABC
ABC techniques can significantly reduce the time, cost and risk of bridge repairs and replacements. Construction pre-planning, pre-fabricated materials and careful jobsite coordination allow new bridges to be installed quickly. They minimize risks to construction crews and the public while maintaining safety and quality.
Northern Construction has deep experience implementing ABC techniques in our bridge replacement projects. If you’re looking for an experienced civil contractor for transportation infrastructure projects, we can design and implement a plan that minimizes disruptions and results in a quality final product.
Contact Northern Construction to learn more about accelerated bridge construction.
Accelerated Bridge Construction FAQs
Traditional bridge replacement projects may take weeks, months or years to complete. However, accelerated bridge construction (ABC) can significantly shorten the bridge replacement timeline, with some projects completed in just a few days. Under the shorter timeline, you can avoid many of the extended traffic delays, road closures and safety risks included in traditional bridge construction.
Many bridge replacement projects occur on weekends due to less commuter traffic. Sometimes, work will also take place at night, when traffic is lower. This helps reduce traffic delays and creates safer conditions for motorists and crews around the construction site.
Accelerated bridge construction is safe and efficient if properly planned and executed. Contractors using responsible ABC practices will leverage extensive pre-construction planning, detailed sequencing strategies and continuous coordination to streamline the process. Before the bridge reopens, thorough quality control and safety inspections will occur.
Prefabricated bridge elements are pieces of a new bridge’s superstructure, substructure and other components that are manufactured and partially assembled away from the construction site. They may include beams, bridge decks, abutments, wingwalls, panels and parapets. Each piece is created and inspected for safety before being sent to the jobsite.