I think everyone should watch this. It doesn't matter if you commute, race, MTB along the side of a tractor, or just get out of bed. This effects everyone.
Quote "I'm reasonably sure that people I know who cycle in town aren't daft enough to undertake indicating vehicles, but if you don't know WHY you shouldn't, please have a look at this."
If you don't WHY you shouldn't be on the road FULL STOP never mind having a look at this !!!!