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 MACAC 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.