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Appendix A. Taxonomyof Messages and Uses

Publication Number: FHWA-HRT-17-014 Date: April 2018

Publication Number: FHWA-HRT-17-014
Date: April 2018

State of the Practice for Traveler Information During Nonrecurring Events

Appendix A. Taxonomy of Messages and Uses

A goal of the current study was to provide a list of representative messages for nonrecurring events that can be used for subsequent testing and guidance. The following table provides example messages for a range of events, as well as considerations of message timing in respect to the event and delivery method. Example messages were changed or tailored to be generic for the purposes of this table. There are cases where there is no information beyond the event type of specific event. These have been left in the table for the purposes of being comprehensive and in respect to the original goal of providing a range of considerations for testing. Example messages can be created for these categories for subsequent testing.

Table 3. Example messages for nonrecurring events.
Type of Event	Specific Event	Type of Information Presented in Relation to Event Timing				Delivery Method	Example Message
Type of Event	Specific Event	Hours Before Event	Minutes Before Event	At Time of Event	Minutes After Event Started	Delivery Method	Example Message
Incident	Crash	—	—	Incident occurrence (location, lane closures, etc.)	Incident occurrence (location, lane closures, etc.)	DMS	I-95 NB CRASH; AT RTE 240; EXPECT LONG DELAYS
Work zone	Speed management	Awareness of the presence of work zones along a route	Initial/ advisory speed control	Regulatory speed	Regulatory speed	—	CONGESTION AHEAD/REDUCED SPEED; XX MPH
Work zone	Queue management	Awareness of the presence of work zones along a route, departure time, and route selection	Initial queue warning	Specific speed/ merging action	Specific speed/merging action	—	WATCH FOR STOPPED TRAFFIC
Work zone	Lane configuration/ closure	Awareness of the presence of work zones along a route, departure time, and route selection	Initial notice of lane closure/ configurations	Specific merging/ lane tracking	Specific merging/ lane tracking	DMS	RIGHT LANE CLOSED; X MILES AHEAD/REDUCE SPEED
Work zone	Lane shift	Awareness of the presence of work zones along a route, departure time, and route selection	Initial notice of lane configurations	Specific lane guidance	Specific lane guidance	DMS	—
Weather	Snow	Awareness of the presence of work zones along a route, departure time, and route selection	Alert to upcoming condition; route change	Advisory or regulatory speed	Advisory or regulatory speed	Mobile app	Heavy Snow
Weather	Intermittent icy spots	—	—	—	—	DMS	ICY SPOTS, NEXT X MILES
Weather	Icy roads	—	—	—	—	DMS	ICE ON BRIDGE SLOW
Weather	Rain	Departure time	Initial/advisory speed control	—	—	DMS	PERIODIC RAIN REDUCE SPEED USE HEADLIGHTS
Weather	Wind/high wind	—	—	—	—	511 website	I-70 Westbound/ Eastbound Georgetown to Genesee (Milemarker 228–259). High wind advisory.
Weather	Fog/low visibility	—	—	—	—	Social media	*TRAVEL ALERT *High winds, blowing dust, and limited visibility
Weather	Flooding	—	—	—	—	DMS	CAUTION FLOODING AHEAD
Weather	Hurricane	—	—	—	—	DMS	HURRICANE WARNING SEEK SHELTER
Weather	Full roadway closure	—	—	—	—	DMS, Web app	ALL LANES CLOSED
Planned special event	Detours	—	—	—	—	DMS	ROAD CLOSED AHEAD; FOLLOW DETOUR
Planned special event	Traffic signal control	—	—	—	—	—	—
Planned special event	Remote video access	—	—	—	—	—	—
Evacuation	Lane reversals	—	—	—	—	—	—
Evacuation	Detours	—	—	—	—	DMS	—
Other	Smoke warning	—	—	—	—	511 website	Motorists are advised of possible heavy smoke on Interstate 10 east and west bound in Santa Rosa County. Use caution.
Other	Road blockage	—	—	—	—	Twitter™	Downed trees are causing issues on I-277 in Charlotte. Crews working to clear road before evening rush hour.
Other	Dangerous road conditions	—	—	—	—	Social media	Magnitude 4.8 earthquake followed by two small jolts strike east of Fresno
Other	Ramp metering	—	—	—	—	CMS	METER ON

—A lack of information was found during the scan. Cells are provided as an indication of considerations to subsequently test.

Page Owner: Office of Research, Development, and Technology, Office of Safety, RDT

Topics: research, safety
Keywords: research, safety, Nonrecurring event, Decisionmaking, Traveler information, Road weather information, Special events
TRT Terms: research, Safety and security, Safety, Transportation safety
Scheduled Update: Archive - No Update needed

This page last modified on 08/24/2018