• anthem
  • arizona
  • basic safety message (bsm)
  • connected vehicle message
  • dedicated short range communication (dsrc)
  • + 10

Multi-Modal Intelligent Traffic Signal Systems Basic Safety Message

Multi-Modal Intelligent Traffic Signal Systems Basic Safety Message

The data attached and/or displayed were collected during the Multi-Modal Intelligent Transportation Signal Systems (MMITSS) study. MMITSS is a next-generation traffic signal system that seeks to provide a comprehensive traffic information framework to service all modes of transportation.

A BSM is one of the messages belonging to the Society of Automotive Engineers (SAE) J2735 Standard. This standard is geared toward supporting the interoperability of DSRC applications through the use of a standardized message set and its data frames and data elements. A BSM, which is at times referred to as a “heartbeat” message, is a frequently transmitted message (usually at approximately 10Hz) that is meant to increase a vehicle’s situational awareness. These messages are intended to be used for a variety of applications to exchange safety data regarding a vehicle’s state.

A typical BSM contains up to two parts. Part I, the binary large object (blob), is included in every BSM. It contains the fundamental data elements that describe a vehicle’s position (latitude, longitude, elevation) and motion (heading, speed, acceleration). Part II of a BSM contains optional data that is transmitted when required or in response to an event. Typically Part II contains data that serves as an extension of vehicle safety information (path history, path prediction, event flags) and data pertaining to the status of a vehicle’s components, such as lights, wipers, and brakes. 

NOTE: All extra attachments are located in Multi-Modal Intelligent Traffic Signal Systems Basic Safety Messages such as MAP, Detectors, and Simulation results


NameSocrata field nameColumn name in sgr mountData typeDescription
US States:@computed_region_28hd_vqqn:@computed_region_28hd_vqqnNumber
Location (zip)location_ziplocation_zipText
Location (state)location_statelocation_stateText
Location (city)location_citylocation_cityText
Location (address)location_addresslocation_addressText
TypetypetypeTextThis field contains the type of the collected data.
TimestamptimestamptimestampNumberThis field contains the time in deciseconds with an Epoch time format.
MsgCntmsgcntmsgcntTextThis data element is used to provide a sequence number within a stream of messages from the same sender with the hexadecimal numeral system.
TempIDtempidtempidNumberThis field contains the ID (number) of the device (or vehicle) that transmits a BSM.
SecMarksecmarksecmarkNumberThis field SecMark is a simple value consisting of integer values from zero to 59900 representing the milliseconds of a wall clock minute.
ElevationelevelevNumberThis field contains the current elevation, in feet, of vehicle according to GPS.
HeadingheadingheadingNumberThis field contains the vehicle heading/direction, in degrees.
LatitudelatitudelatitudeNumberThis field contains the current latitude, in degrees, of the vehicle.
LongitudelongitudelongitudeNumberThis field contains the current longitude, in degrees, of the vehicle.
SpeedspeedspeedNumberThis field contains the vehicle speed in km/hr.
MsgIDmsgidmsgidNumberThe DSRC Message ID is a data element used in each message to define which type of message follows from the message set defined by this Standard. This data element is always the first value inside the message and is used to tell the receiving application how to interpret the remaining bytes (i.e. what message structure has been used). This value is enumerated and the values and corresponding meaning are as follows: 0 – Reserved, 1 – A La Carte Message (ACM), 2 – Basic Safety Message (BSM – heartbeat message), 3 – Basic Safety Message Verbose (BSM used for testing only), 4 – Common Safety Request (CSR), 5 – Emergency Vehicle Alert (EVA), 6 – Intersection Collision Alert (ICA), 7 – Map Data (MAP, GID, intersections), 8 – nmea Corrections (NMEA), 9 – probe Data Management (PDM), 10 – probe Vehicle Data (PVD), 11 – Roadside Alert (RSA), 12 – rtcm Corrections (RTCM), 13 – Signal Phase And Timing Message (SPAT), 14 – Signal Request Message (SRM), 15 – Signal Status Message (SSM), 16 – Traveler Information (TIM)

Upstream Metadata