The B45 starts at the Red Houses crossroads on the A13 and heads south. It heads downhill, quickly entering a small wooded valley which hides the posh houses to either side. As the route levels out, it passes an old hotel and then a scattering of houses before emerging at the churchyard for St Brelade's Church. Somewhere here the route ends, end-on with the B66, although the exact spot is not marked, and there seems little sense in this one road changing number.
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