William Preston Lane Jr. Memorial (Bay) Bridge Automated Lane Closure System Project
The Bay Bridge automated lane closure system (ALCS) is a project constructed for opening and closing lanes including two-way trafﬁc operations on the bridge. Since two-way operations were implemented, lane closures have been done manually. The ALCS will enhance the current manual system for motorists by allowing maintenance crews to remotely implement and discontinue two-way trafﬁc on the Bay Bridge’s Eastern and Western Shores.
The ALCS includes overhead lane-use control signals, dynamic message signs, horizontal swing gates, and illuminated pavement markers. These enhancements are integrated into the existing bridge trafﬁc control system.
Work on the project, such as conduit boring and installation, began in February 2020 on the Eastern Shore and January 2021 on the Western Shore. In Fall 2022, the MDTA began a phased implementation of the Bay Bridge ALCS to familiarize motorists to the new system. This transitional period includes some manual support of the system, with cones and barrels still present. Throughout the course of winter 2022/2023, additional phases of the system will be implemented on the Eastern and Western Shores.
The MDTA reminds those traveling on the Bay Bridge to adhere to overhead lane-use control signals for the safety of traffic operations and motorists.
Overhead Lane-Use Control Signals
- RED X - Lane is closed. Do not enter or travel in lane.
- YELLOW X - Vacate lane. Move to a lane with DOWNWARD GREEN ARROW.
- DOWNWARD GREEN ARROW - Lane is open.
*Failure to obey overhead lane-use control signals is subject to citation under Transportation Article, Section 21-204.1 – Lane direction control signals: “Where lane direction control signals are placed over the individual lanes of a highway, vehicular traffic may travel in any lane over which a green signal is shown, but may not enter or travel in any lane over which a red signal is shown."
Automated Lane Closure System from TheMDTA on Vimeo.
Dynamic message sign, overhead lane-use control signals and horizontal swing gates along westbound US 50/301 approaching the Bay Bridge.
BAY BRIDGE AUTOMATED LANE CLOSURE SYSTEM
(Westbound US 50/301) Driver’s Update
The Bay Bridge Automated Lane Closure System (ALCS) – designed to improve safety and the efﬁciency of bridge lane closures – is rolling out in phases, starting with westbound US 50/301 approaching the Bay Bridge from the Eastern Shore. Effective Dec. 20, 2022, the ALCS horizontal swing gates, illuminated pavement markers, full-color dynamic message signs (DMS) and overhead lane-use control signals now work in tandem to alert and guide motorists when lanes are opening and closing to accommodate two-way trafﬁc operations on the westbound span. In November 2022, the new larger overhead lane-use control signals and DMS were activated.
- Stay alert, obey posted speeds and keep moving through the open lanes.
- Overhead lane-use control signals warn drivers of lane closures starting 1.5 miles before the westbound span.
- During this transition period barrels still will be used.
- Additional phases of the system will be implemented on the Eastern and Western Shores throughout the course of Winter 2022/2023.
For 24/7 Bay Bridge trafﬁc information, call 1-877-BAYSPAN (1-877-229-7726) or visit baybridge.com. For real-time updates on major incidents follow us on Twitter at twitter.com/TheMDTA. Sign up for email/ text alerts at https://bit.ly/2Dh9EZn. Find us at facebook.com/TheMDTA.
Illuminated pavement markers.
Automated Lane Closure System (ALCS) Simulation
- ALCS Lane Use Signals at the Bay Bridge (video link)
- News Release: Arriving on the Western Shore: Next Phase of Bay Bridge Automated Lane Closure System Begins
- Bay Bridge Automated Lane Closure System (ALCS) Drivers Update Flyer (PDF Download)
- News Release: MDTA Automated Lane Closure System News Release 12-13-2022
- BBRAG Bay Bridge Automated Lane Closure System (ALCS) Presentation 4-6-2022 (PDF Download)
- MDTA Bay Bridge Gates Flyer PDF (8MB Download)