Advice to travellers!

"Visitors are informed that in the United Kingdom traffic drives on the left-hand side of the road. In the interests of safety, you are advised to practise this in your country of origin for a week or two before driving in the UK."

Leaving the airport early this morning was reminded of the above bit of advice! But I also wondered whether on the basis of actual Edinburgh traffic - would a notice in Urdu and Polish not be more effective and useful than one in Portuguese?