SPD-HARM Scenario 2:
Work Zone
Work Zone
77
SPD-HARM App
Data
Collection
Algorithm
Data Environment
Vehicle A
On-board
Sensors
Data
Collection
Data
Broadcast
Algorithm/
Decision
Engine
Vehicle B
On-board
Sensors
Data
Collection
Data
Broadcast
Algorithm/
Decision
Engine
Roadway
Detectors
DMS
VSL
TMC
DSS
FMS
AMS
3rd Party Data
Sources
Data Feeds
Weather Feeds
Work Zone
ATMS
Data Feeds
1
1
Vehicle broadcasts status information (speed, heading, location, etc.)
2
Data
collected in Data Environment
2
3
3
Roadway
sensors provide data to DE
4
3rd party data feeds
provided to DE
4
5
Due to construction activities, Work Zone ATMS generates speed reduction plan for approaching traffic
5
6
SPD-HARM application receives plan,
provides instructions to approaching
vehicles
6
Vehicles/drivers implement harmonized speed reduction
7
7
