Unlike other diehard urbexers in this burg – risking life, limb and liberty in pursuit of derelict buildings, tunnels and mysterious corners – I stick to the highway. Which on the main artery to southside Glasgow gets all the harder. Hour by hour, shift by shift, the most visible new track in the city, the M74 Extension, ploughs over Eglinton Street, the old A77 – through entire communities whose names – Polmadie, Oatlands, Dalmarnock – may be lost forever…