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In ad hoc networks, any concurrent transmission will add to the level of interference and collision experienced by other users. The spatial density of transmissions that could be supported subject to two constraints: the excessive interference of attempted receivers, the channel access collision of attempted transmitters. We combine two constraint factors and define channel interference and access delay (CIAD) routing metric. CIAD may balance interference, access delay and length of a route. CIAD can avoid accessing the areas with high interference and overfull channel competition. In this paper, we implement a more realistic channel model to calculate the aggregate interference and the bite error rate (BER) in NS-2. We show through simulation that our proposal increases throughput, reduces the end-to-end delay. The simulation results illustrate that our protocol is able to achieve better performance than dynamic source routing (DSR).