red, yellow and blue

I've been set a challenge to shoot images using primary colours in the online course I've been doing ,run by the excellent Paul Sanders. After this evenings session I went out for a walk to take some photos of the buses going by.  I was hoping to get a person in one but at this time they're mainly empty, except of course for the driver. 
I find it much easier to shoot with a theme in mind so may blip a few more red/blue/yellow images over the next couple of weeks. 
  Many thanks for the generous comments and stars after my 2,500th blip yesterday. Theyre all much appreciated.