Resource management in vehicular WiFi networks is an interesting and challenging issue. In this paper, we propose a mobility-aware call admission control (MA-CAC) algorithm where different admission control policies are employed depending on the mobility. Specifically, when a vehicle is static, a handoff priority scheme with guard channels is examined to protect vehicular handoff users. On the other hand, for a moving vehicle, no guard channels for handoff users are allocated for maximizing channel utilization since there are no vehicular handoff users. By means of Markov chains, we evaluate the MA-CAC algorithm in terms of new call blocking probability, handoff call dropping probability, and channel utilization. Numerical results demonstrate that the MA-CAC algorithm can lower the handoff call dropping probability while maintaining high channel utilization.