Doubles and triples: Question Doubles and triples: Answers Can swerve more easily than most other vehicles. Should be driven 20 mph slower than posted speed limits. Require the driver to identify hazards well in advance. Should not be driven in the rain. Explanation To avoid rolling over and jackknifing, doubles and triples must be driven smoothly. To allow this, drivers should look well ahead of their vehicles so they can spot hazards early and have as much time as possible to make the necessary maneuvers. This questions appears in the following tests: Alabama Double North Dakota Double