Work Zone Mobility and Safety Program
Photo collage: temporary lane closure, road marking installation, cone with mounted warning light, and drum separated work zones.
Office of Operations 21st Century Operations Using 21st Century Technologies

Best Practice

BEST PRACTICE:

G4-22: Audible Information Devices

DESCRIPTION:

Audible information devices are designed to maintain accessible pedestrian routes during construction-induced sidewalk closures. Their function is to warn visually impaired pedestrians of upcoming sidewalk closures and will provide detailed navigation instructions for temporary pedestrian route detours. Devices are positioned no more than 100 feet prior to the defined sidewalk closure. As pedestrians approach, they hear a unique locator tone familiar to the visually impaired. Pedestrians may then locate Braille instructions or the push button feature to activate the voice module to hear or read the navigation instructions.

REASON(S) FOR ADOPTING:

Pedestrians should be provided with a reasonably safe, convenient, and accessible path that replicates as nearly as practical the most desirable characteristics of the existing sidewalk or footpath. Where pedestrians who have visual disabilities encounter work sites that require them to cross the roadway to find an accessible route, instructions should be provided using an audible information device. Providing adequate warning for pedestrians with vision and mobility disabilities in urban and suburban work zone locations helps ensure that work zones meet ADA compliance during construction.

PRIMARY BENEFIT(S):

The ADA-compliant devices also help maintain separation between pedestrians and traffic as well as accessibility to businesses, residences, and other facilities while minimizing the length of the temporary route so it is not much longer than the original route.

MOST APPLICABLE LOCATION(S)/PROJECT(S):

Audible warning information devices are applicable for temporary traffic control zones in urban areas, however they may also be applied in suburban and rural work zones with existing pedestrian facilities.

STATE(S) WHERE USED:

California , Iowa, Massachusetts, Minnesota, Texas

SOURCE/CONTACT(S):

Samir Ead, Construction Safety Coordinator, Caltrans
Phone: (916) 654-4580
E−mail: Samir.ead@dot.ca.gov

Chris Poole, Office of Traffic and Safety
Iowa Department of Transportation
Phone: (515) 239-1267
Email: chris.poole@dot.iowa.gov

Neil E. Boudreau, State Traffic Engineer
Massachusetts DOT
(857) 368-9655
Email: neil.boudreau@state.ma.us

Ken Johnson, Work Zone Coordinator
Minnesota DOT
(651) 234-7386
Email: ken.johnson@state.mn.us

Douglas Skowronek, Traffic Operations Division
Texas DOT
Phone: (512) 416-3120
Email: doug.skowronek@txdot.gov

Office of Operations