Information on traffic flowson Scottish trunk roads is collected in terms of Annual Average Daily Flows fordifferent classes of vehicle.Traffic data extracted from the Scottish Roads Traffic Database (SRTDb) for the A9 between Perth and Stirling and theA90 between Perth and Dundee from the automatic traffic counter sites at A9 Blackfordand A90 Longforgan shows the following traffic flows:A9Blackford Year Annual Average Daily Flow (AADF) All Vehicles AADF Cars Only 2001 18,480 15,089 2002 *N/A *N/A 2003 25,596 19,547 2004 24,592 19,671 2005 25,742 20,729 Note: *Data not available becauseof equipment failure.A90 Longforgan Year Annual Average Daily Flow (AADF) All Vehicles AADF Cars Only 2001 31,584 24,293 2002 32,262 24,936 2003 32,828 26,352 2004 32,476 27,049 2005 34,808 28,596 Transport Scotland...