Although the relationship between road improvement and agricultural development has long been studied, there are few studies that analyze the effect of road quality on smallholder farmers access to agricultural markets. This empirical study of smallholder potato producers in (South Kinangop) rural Kenya tries to fill this gap. Results of partial and multivariate analyses indicate that road quality and increase in market accessibility have significant effect on fertiliser use. Similarly, the use of fertiliser has a strong and significant effect on potato yield. These findings demonstrate that...