Changes

To head north (through Perth) the best place seems to be on Queensferry Road, just past Barton junction: plenty of traffic going north, they see you from far and there are many good spots with some space for cars to stop, especially a large bus stop. To get there, take bus 41 (Lothian buses) or 43/X43 (First) from the city center centre (George Street, GBP 1.50) and ask the driver to be told when you're at Barnton junction. Follow the bus for about 500 metres and you'll reach said bus stop. A sign might be helpful but is not absolutely necessary.