 It then merges into the A429 very briefly before heading towards Leamington.It forms the main road from Warwick to Leamington, crossing into the latter town at the Portobello Bridge over the River Avon near that river's junction with the River Leam.Just east of the bridge the A445 has a junction with the B4099 with the B route heading into central Leamington and the A445 skirting the north of the town.