The radar
sensor collects traffic information at a constant interval, and
then transmits it over the Internet using TCP/IP protocol to a
computer server as shown in Figure 3. The computer server
is installed with the software for data analysis and incident
classification as they are proposed in this work. The data
obtained from UMRR are in the packet format, as shown in
Figure 4, including 4 bytes of headers, 4 bytes of message id,
8 bytes of data payload and 4 bytes of time stamp. In each
time interval, the data are obtained as shown in Figure 5, and
decoded as the vehicle position, speed, and size as shown in
Table 1