At Trim, the route bypasses the town centre along the Inner Relief Road, with junctions to the R160, R158 and R161. From Trim the R154 runs north to meet the N51 at Athboy.
In Trim, the route circumvents the town center via the Inner Relief Road, linking to the R160, R158, and R161. Starting from Trim, the R154 extends northwards to converge with the N51 at Athboy.