The dismount applies to sidewalk cyclist since they're using the crosswalk signal. If you're riding on the road, dismount doesn't apply. At least I've never seen that requirement on a roadway.
Originally Posted by
GlennR
You should be riding in the road, crosswalks are for pedestrians.
I couldn't agree more. I'd never ride my bike on the sidewalk weaving in and around pedestrians. Nevertheless, its not illegal in most cases.