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U.S.
Department of Transportation
BASIC SAFETY MESSAGE (BSM) FUNDAMENTALS
§Connected V2V safety
applications are built around the BSM, which has two
parts
□BSM Part
1:
▪Contains the core data elements (vehicle size, position,
speed, heading acceleration, brake system status)
▪Transmitted approximately 10 times per second
□BSM Part
2:
▪Added to part 1 depending upon events (e.g., ABS
activated)
▪Contains a variable set of data elements drawn from many
optional data elements (availability by vehicle model
varies)
▪Transmitted less frequently
□No
on-vehicle BSM storage of BSM data
□The BSM
is transmitted over DSRC (range ~1,000 meters)
§The BSM is tailored for
low latency, localized broadcast required by V2V
safety applications