Which are the areas you must not drive into when there is traffic congestion?

Your answer is correct. In traffic congestion, you must not drive into crossroads or level crossings if you cannot clear them completely due to a traffic jam. Blocking crossroads can prevent cross-traffic and emergency vehicles from passing through, and stopping on level crossings is extremely dangerous because of incoming trains. Driveways, however, are not included in this rule; blocking them is inconsiderate but not as strictly regulated as crossroads and level crossings. Always make sure you can pass through these critical areas without stopping to avoid endangering yourself and others.