Not exactly a positive one though judging by this...
Taken from http://forum.hondarevolutions.com/viewtopic.php?t=47478Last Updated: 14/04/2005 13:15
Road Incident
M4 Closed between J18 and J19 in Westbound direction.
M4 Overturned vehicle(s) between J14 and J15 in Westbound direction.
M4 Overturned vehicle(s) between J15 and Membury Services in Eastbound direction.
M4 Queuing traffic between J18 and J19 in Westbound direction.
Rumour has it that at least one of those was caused by panic braking.
From an official "inside" source.