[Closed] Garmin Edge 800 Directions

This morning I wanted to divert via my garage on the way to work, and pretty much knew what route I wanted to take, but thought I'd set the destination in my Edge 800 just as back-up as it's not a route I'm particularly familiar with cycling.

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This is the route I'd planned - pretty much due-west through Kingston, Hampton court, Molsey.

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This is roughly what my Garmin wanted me to do!

I set off completely ignoring it and it recalculated the route each time I didn't take a turning it wanted me to, and once I got to Raynes Park it seemed as though my intended route correlated with what it wanted.

However, after crossing the Thames at Kingston, it then wanted me to take a random right-turn, and the route had morphed into something like this:

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It appeared as though it wanted to avoid Hampton Court Bridge like the plague for some reason.

It's a good thing I did know where I was going and a sensible route else I would have ridden about twice the required distance by blindly following my computer!

I can understand why it would try and keep me off motorways and nasty dual-carriageways, but does anyone know more about the criteria it uses to determine routes?

Cheers, Rich