SPD-HARM Scenario 3:
Weather Conditions
Weather Conditions
78
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 weather-related sensor information (windshield wiper activation, outside temp reading, etc.)
2
Data
collected in Data Environment
2
3
3
Roadway
sensors provide data to DE
4
3rd party data feeds provided weather data to DE
4
5
Roadside weather stations and other weather systems provide data to DE
5
6
SPD-HARM application generates speed reduction and harmonization plan; provides instructions to affected vehicles
6
Vehicles/drivers implement harmonized speed reduction
7
7
