 East of Blackheath station the SCR looped south-east to follow the railway line through the north side of Blackheath Park, where some demolitions would have been necessary, before skirting the sports ground and Kidbrooke station to meet the junction of the East Cross Route coming south from the Blackwall Tunnel, the A2 Rochester Way Relief Road coming east from Eltham and the A20 coming north from Mottingham.This junction, the south-east corner of the London Motorway Box, would not have provided traffic movements in all directions.it is probable that SCR traffic would have been directed onto the A2 or A20 and would not have been able to access the East Cross Route northbound.