It is the A2216 Lordship Lane at the junction with the A205 Dulwich Common, London, SE22.
It is 3 and half miles from Poyners Court to this junction. The vehicle that folk think is suspicious is turning right from Lordship Lane southbound onto A205 Dulwich Common (the road) which would take the driver back towards Poyners Court (3 and half miles away). Why would an offender with a live, struggling victim be heading back towards the place that she was last seen?
The quality of the CCTV is very poor, with glare and distortion. It is very difficult to make out exactly what is going on. It is very easy for the mind to make up what it wants to see. Caution is always advised.
I have attached street view and road map for ease of reference.
Google Maps
Google Maps