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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." 

ALCS Lane Use Signals at the Bay Bridge

Automated Lane Closure System from TheMDTA on Vimeo.

Bay Bridge Automated Lane Closure System Westbound 50/301 Driver's Update

Dynamic message sign, overhead lane-use control signals and horizontal swing gates along westbound US 50/301 approaching the Bay Bridge.



(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 For real-time updates on major incidents follow us on Twitter at Sign up for email/ text alerts at Find us at

Illuminated pavement markers.


Public Calendar

Jun 08

Finance Committee Meeting - June 8, 2023

9 AM

Virtual Teams Meeting

This public meeting is livestreamed and archived on the Finance Committee Meeting Homepage. The Finance Committee Meeting homepage also provides access to the virtual meeting, schedule, agenda, materials and minutes.

Jun 09

Hiring Event - JFK Administration Building

12 PM

MDTA Hiring Event Onsite Interviews

Hiring Event for Highway Maintenance Workers with On-Site Interviews

We're holding a Highway Maintenance Worker hiring event at the JFK Administration Building. Same day, on-site interviews! If you can't make it, apply online here

June 9, 2023
12 pm – 5 pm

John F. Kennedy Highway Administration Building 1
Turnpike Drive
Perryville, MD 21903

On-Site Same Day Interviews

  • No experience required
  • Must have a valid driver’s license
  • Please bring a valid government-issued ID to interview

Reap the rewards of State employment!

  • Pension | Medical | Dental |Prescription
  • Tuition Assistance | Generous Time Off | Life Insurance
  • Variety of job tasks & locations available

Event Flyer (PDF Download)

You belong at the MDTA!

Jun 14

Doing Business with the MDTA Development Workshop - Free

9 AM

MDOT Headquarters
Harry Hughes Conference Room
7201 Corporate Center Drive
Hanover, Maryland 21076

Doing Business with the MDTA

Free Development Workshop
Division of Civil Rights & Fair Practices (CRFP)

Wednesday, June 14, 2023
9am to 1pm

  • Free to attend.
  • Network with Primes, MDTA Procurement Officers and MDTA CRFP Compliance Officers.
  • Learn about resources to assist in growing and strengthening your business.
  • Understand the MBE/VSBE/DBE Programs and your role as a prime or subcontractor.

Register on Eventbrite: 
Registration Opens May 1, 2023

Email any questions to:

Additional Information:

To learn more visit:
Getting Your Foot In The Door | MDTA (