The Government Says

Safety barrier upgrade for m23

Work to upgrade safety barriers on the M23 in West Sussex begins next week.

http://nds.coi.gov.uk//content/../ClientMicrosite/Content/Detail.aspx?ClientId=36&NewsAreaId=2&ReleaseID=421316&SubjectId=36

seen at 09:13, 23 September in National College For School Leadership News - national.