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In this paper, mathematical analysis supported by computer simulation are used to study the impact of vehicular traffic on the performance of cellular wireless network operating at carrier frequencies greater than 2 GHz. The performance analysis is founded on the uplink information capacity of a cellular wireless system where co-channel interference are from multiple tiers. Results show that for both light and heavy vehicular traffic environment, at higher carrier frequencies and smaller cell size, other tiers of co-channel interfering cells become active. The results also that for heavy vehicular traffic the decrease in information capacity was lesser as compare to light vehicular traffic.