The average annual pattern by the mobile unit of the Scottish Driving Assessment Service, taking 2007-08 as the reference year, is: Mobile Service Site Number and Duration of Visits Total Number of Patients Seen Inverness 3 visits lasting 4 weeks 29 Aberdeen 4 visits lasting 7 weeks 64 Dundee 4 visits lasting 6 weeks 51 Paisley 8 visits lasting 18 weeks 147 Irvine 4 visits lasting 7 weeks 56 Dumfries 5 visits lasting 6 weeks 33 nt.uk/webapp/wa.search"http://www.scottish.parliament.uk/webapp/wa.search.