Cooperative Automated Transportation (CAT)

Cooperative Automated Transportation

Roadway safety in a cooperative automated world

Highway automation is not years away, or even days away. It’s here now, causing a number of state transportation agencies to react with initiatives related to preparing and supporting Connected Automated Vehicles (CAVs) on U.S. roadways.


Connected and Automated Vehicles (CAVs)

Cooperative Automated Transportation (CAT) deals with CAVs, which are vehicles capable of driving on their own with limited or no human involvement in navigation and control. Per the definition adopted by the National Highway Traffic Safety Administration (NHTSA), there are six levels of automation (Levels 0-2: driver assistance and Levels 3-5: HAV), each of which requires its own specification and marketplace considerations.


Vehicle-to-Everything (V2X) and Connected and Automated Vehicles (CAVs)

For traffic safety, vehicle-to-everything communications is the wireless exchange of critical safety and operational data between vehicles and anything else. The "X" could be roadway infrastructure, other vehicles, roadway workers or other safety and communication devices. ATSSA members are at the forefront of these technologies, and are working with stakeholders across new industries to see these innovations come to life.


Sensor Technology

CAVs rely on three main groups of sensors: camera, radar, and Light Detection and Ranging (LIDAR). The camera sensors capture moving objects and the outlines of roadway devices to get speed and distance data. Short- and long-range radar sensors work to detect traffic from the front and the back of CAVs. LIDAR systems produce three-dimensional images of both moving and stationary objects.


For more information about ATSSA’s efforts on CAT and CAV’s and their interaction with our member products check out the resources below.




Resources

FHWA issues interim approval of Rectangular Rapid-Flashing Beacons at crosswalks
Josh WIlliams
/ Categories: Innovation, Roadway

FHWA issues interim approval of Rectangular Rapid-Flashing Beacons at crosswalks

The new IA-21 allows for the optional use of RRFBs as pedestrian-activated visibility enhancements for pedestrian and school crossing warning signs under limited conditions.

In a memorandum released on March 20, the Federal Highway Administration (FHWA) issued “Interim Approval (IA)-21 – Rectangular Rapid-Flashing Beacons (RRFBs) at Crosswalks.” The new IA-21 allows for the optional use of RRFBs as pedestrian-activated visibility enhancements for pedestrian and school crossing warning signs under limited conditions.

The temporary approval to use RRFBs comes after IA-11, which originally allowed for the optional use of RRFB as warning beacons, was rescinded in an FHWA memorandum on Dec. 21, 2017 because of patents issued and pending on the device. The memorandum prohibited new installations of RRFBs, however, the flashing devices that were already installed were allowed to remain in service until they were no longer functional.

Most recently, the FHWA has been informed and has confirmed that the patents are no longer being pursued and RRFB devices are once again eligible for temporary use under IA-21. It is important to note this is a new IA with updated research and information regarding RRFBs. Agencies that want to install RRFBs must apply for permission of use from the FHWA under IA-21, even if they were previously granted permission of use under IA-11. IA-21 does not reinstate IA-11.

In general, IAs allow for the temporary use of a new traffic control device, revisions of the application or manner of use of an existing traffic control device, or adherence to a provision not addressed in the Manual on Uniform Traffic Control Devices for Streets and Highways (MUTCD). These permissions are subject to change pending the establishment of official guidelines.

For more information about IA-21, visit http://www.atssa.com/Resources and click on “FHWA issues interim approval.” For any additional questions about IA-11 or IA-21, email Duane Thomas at Duane.Thomas@dot.gov.

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