Investigations are continuing into how a teenager ended up in the middle of the M27 in the early hours of Sunday morning.
The 17-year-old boy was found with serious injuries between junctions seven and five on the westbound carriageway.
Hampshire Police are appealing for witnesses in the area just after midnight - who saw any pedestrians near the motorway or the Botley Road bridge which runs overhead.
The force is emphasising that anyone who was with the teenager is not in trouble- they simply want to establish what happened.
The westbound carriageway between junctions 7 and 5 was closed for several hours, but has since re-opened.