WYDOT Update at the Application Design Stage Webinar Q&A

  1. Does the CV implementation environment also include the secure credential management system? If yes, how was this component implemented?

Answer: The Pilot is using the SCMS which is being integrated into the OBUs, RSUs and the HSM in the TMC. We are using the SCMS bootstrap as well as certificates for signing and validating messages.

  1. How much distance on I-80 will these 75 RSUs will cover, and what is the average distance between the RSUs (500 meters for example)?

Answer: An analysis was done that identified weather/accident hotspots as good locations for some of the RSUs. In some areas of the interstate, the eastbound and westbound directions diverge enough that RSUs were placed for each direction of travel to get adequate coverage. In general, RSUs are between 2 and 20 miles apart and they are broadcasting between 300 and 2000 meters.

  1. What are some options/examples/scenarios you're exploring for communicating BSM and informational items to the driver without distracting them?

Answer: One of our team members who is a professor at University of WY, Mohamad Ahmed, is working with Lear on finding notifications that would be the least distracting for drivers. Mohamad has a full cab truck simulator to test eye movements for distraction from the road.

  1. What satellite tech/vendor is being used?

Answer: We are using Sirius XM for satellite services.  These SXM radios are installed in both the Lear and SXM OBU’s.

  1. Aren't there sensors used for detection of obstacles on the road (be it rocks, animals, breakdown vehicles, ...) or is the micro climate the only focus of the sensors?

Answer: The sensors WYDOT is using are specifically for microclimate (temperature, humidity, precipitation, etc.). This pilot is not implementing RADAR/LIDAR for detecting objects in the road.

  1. Are we considering vehicle stopping sight distance or the distance that a vehicle can coast to a slower speed?

Answer: At this point, we are looking at a crawl-walk-run. We will be using slow down metrics based on vehicle type for time-to-collision. In the future, we will look at the vehicle gyroscopes and road condition information to determine grade and surface condition to know how much time to give the drivers.

  1. Have you considered the usage of Cellular towers to be integrated with DSRC RSUs for V2I applications; in this way you don’t need large number of RSUs to have more coverage of the I-80 corridor?

Answer: This was looked into, but in the end, we decided not to incorporate this into the pilot.

  1. Are you using a linear referencing system to locate vehicles, work zones, incidents, etc. or just GPS and map matching?

Answer: Linear Referencing System is used in the TMC for road layout, but for TIMs for the CVs, we use WGS84 (lat/log) elevation that is GPS-based.

  1. Are the satellite signals being received by the OBU or is there a different hardware that processes this information?

Answer: The OBUs have built-in satellite receivers, so no additional hardware is needed other than OBU and their antennas.

  1. Are Distress Notification messages validated before being re-broadcast by RSUs (e.g. in the TRAC)? If so, how? Are fake DNs something you are concerned about?

Answer: It is possible to have fake messages sent out but it is not something we are overly concerned about.

  1. What is the status of the deployment (RSUs installed, fleet with OBU ready, etc.)?

Answer: So far, we have 40 RSUs and 10 OBUs already installed (3 in Snow Plows, 1 patrol vehicle, 6 in test vehicles).

  1. Who is doing the hardware certification for all the RSUs and OBUs?

Answer: Lear and Sirius XM (the vendors) are each doing their hardware certification with OmniAir and are using the 7Layers testing facility.  

  1. Are you using Scrum methodology within Agile?

Answer: We are using Scums but there are a number of teams working on the development working around the country so each team is working in a slightly different manner.

  1. Do vehicles log data from areas outside coverage and dump the data once they get in coverage?

Answer: Yes, logs are retained for 7 days on OBUs, data could be from inside or outside of WY.