The majority of traffic count portable data collections is done by road tube. While the hardware unit costs for road tubes are low, installation requires workers to kneel in the middle of the road sujecting them to potential harm. The TRB IDEA (Innovations Deserving Exploratory Analysis) Program's NCHRP IDEA Final Report for Project 216: A Portable Single Lane Traffic Counting Device details a visually based counting and classification device that is able to achieve expected results. The project report is available from the Transportation Research Board web site at https://www.trb.org/Main/Blurbs/182824.aspx
