Nguyen,
Neither Car.ned nor RSU.ned have an icon configured. Instead, the car
should be rendered as a three pixel (three meter) box and the RSU as a
ten pixel oval.
If you want to configure how the RSU is displayed, you can modify its
RSU.ned file and change the following line:
@display("p=150,140;b=10,10,oval");
to include an OMNeT++ DisplayString component for an icon.
Best,
Christoph
--
Dr. Christoph Sommer
Distributed Embedded Systems Group
University of Paderborn, Germany
http://www.ccs-labs.org/~sommer/