What makes driving in a stream of vehicles easier?

You selected both answer 1 (Watching the queue through the windows of the vehicles travelling in front) and answer 2 (Driving in a slightly staggered position in your own lane), which are correct.

Looking ahead through the windows of vehicles in front allows you to better anticipate traffic flow and react sooner to stops or changes, increasing safety. Driving in a slightly staggered position within your lane improves your view of traffic ahead and to the sides, and also allows more room to react if necessary.

Keeping your hazard warning lights on while driving (answer 3) is not correct; hazard lights should only be used when your vehicle presents a sudden obstruction or is in an emergency situation, not during normal driving in a stream of vehicles.

Remember, anticipating traffic and maintaining good visibility are key for smooth and safe driving in traffic streams.