Convoy witness appeal after fatal A470 crash in Brecon
Motorists who saw a convoy of eight vehicles travelling from Vale of Glamorgan to Powys before a fatal crash are asked to contact police.
Alesha O'Connor, Rhodri Miller, Corey Price, all aged 17 and from Barry, and Margaret Challis, 68, from Merthyr Tydfil, were killed in the collision on the A470 near Storey Arms, Brecon.
Seven people arrested on suspicion of dangerous driving have been bailed.
Police have released details of the route the convoy took on 6 March.
The eight vehicles left McDonald's in Barry at about 20:00 GMT, before travelling along the A4332 towards junction 33 of the M4.
They stopped behind the petrol station at Tesco in Culverhouse Cross before heading onto the A470 towards Brecon.
A black Volkswagen Golf estate and a green Volkswagen Golf were involved in the collision between Libanus and RAC bends near Storey Arms just before 10:15 GMT.
Anyone who saw the convoy along the route is asked to contact the Dyfed-Powys Police on 101.