I think the point being made was when road riding everything around you can potentially give you information. For instance -

- You are following another bike / car and you see there brake lights it would be a fair assumption there is a hazard ahead.

-You are following a bus and you notice a passenger stand up. Perhaps the bus will be slowing down and stopping to let the passenger off shortly.

-Passing parked cars and you spot a person in one of the cars wing mirror. Has that person seen you? Are they just about to open the car door and get out?

There are loads of little ways you can help yourself but you have to be very aware of what is happening around you at all times.

The information is there, it’s what you do with it that counts

Ride safe and ride for yourself. Don't ride outside of your comfort zone to keep up with others.