Law relating to matrix signs on a motorway
Please can you explain to me the law on motorway matrix signs. When it flashes 50 or 30mph, is it mandatory to obey these limits/signs or advisory. I have heard that if the sign is bound by a red circle then it is mandatory but if not then it is advisory,
The detailed law on matrix signs is complex and best summed up at:
http://www.opsi.gov.uk/SI/si2002/20023113.htm#sch11pI
Matrix signs are usually advisory only although you open yourself the the potential of being charged with other offences - due care and attention or careless driving - if you fail to follow their advice.
