A40 Road

From: City of London (near St. Paul's Cathedral)
To: Fishguard, Note: The longest A road in Zone 4 at 256 miles long
Cities: Andoversford, Asthall, Brecon, Carleton, Carmarthen, Gloucester, Huntley, Llandovery, Llanellen, Llansadwrn, Northleach, Pen y Clawdd, Pen-y-banc, Robeston Wathen, Ross on Wye, Saint Clears, South Leigh, Trecastle, Treffgarne, Tretower, Whitland, Windrush, Wyesham, Golden Valley, Tetsworth, Stokenchurch, Beaconsfield, Headington, Yarnton, Nantgaredig, Goodwick, West Wycombe, Northolt, Uxbridge, Notting Hill.