Police have been out and about today asking motorists to stop and read the registration plate of a vehicle parked 20.5 metres away - the legal standard set by the DVLA.
They are warning that drivers who fail this roadside eyesight test could have their licence revoked instantly.
Many sailed through the spot-check - but for others it was a wake-up call, as our correspondent Carl Edwards reports.
More top news
All very dull and grey over the next few days unfortunately, but at least temperatures are degrees milder!
Conservatives claim the poor PISA ranking is a 'scandal of monumental proportions.' Plaid Cymru say the Welsh government has 'failed again.'
Unions are calling on the Welsh Government not to panic and to provide support for teaching staff following the PISA rankings publication.