Model driven approaches have become effective solutions for the development of embedded systems. In particular, models across various abstraction layers, e.g., application, design, and implementation, provide the opportunity for applying different analysis techniques appropriate at various phases of system development. In this paper, we informally show how to validate the design model of an {em Autonomous Truck} embedded system, by comparing its trajectories with the trajectories of the corresponding application model. In the comparison, we also correlate the corresponding time scales of the two different models. The autonomous truck system is designed in the integrated modeling environment of SaveIDE. The system's functional and timing requirements verification is carried out on the truck's design model. Our work can be regarded as a preliminary step towards developing a general solution to the problem of bridging the gap between application and design models of embedded systems.