  This work demonstrates a new capability in roadway control: Speed-adaptive,
infrastructure-linked connected and automated vehicles. We develop and deploy a
lightly modified vehicle that is able to dynamically adjust the vehicle speed
in response to posted variable speed limit messages generated by the
infrastructure using LTE connectivity. This work describes the open source
hardware and software platform that enables integration between
infrastructure-based variable posted speed limits, and existing vehicle
platforms for automated control. The vehicle is deployed in heavy morning
traffic on I-24 in Nashville, TN. The control vehicle follows the posted
variable speed limits, resulting in as much as a 25% reduction in speed
variability compared to a human-piloted vehicle in the same traffic stream.
