Final answer:
The answer is 'Any part, left, merge'. Motor vehicles can be in any part of the left lane and can merge at any time. Safety for crossing lanes, such as a rabbit attempting to cross a freeway, cannot be assured due to potential other vehicle presence.
Step-by-step explanation:
The correct answer to the fill-in-the-blank question regarding motor vehicles is 'Any part, left, merge'. Motor vehicles can occupy space on any part of the left lane and are able to merge into the lane at any time. This applies to roads with multiple lanes of traffic where vehicles have the option to merge into a different lane, typically in pursuit of overtaking another vehicle or in preparation for making a turn.
Regarding the reference to the rabbit, if the car is traveling in the furthest lane from the rabbit, it is still important for the rabbit to be cautious. While the car in the farthest lane may not pose an immediate threat, the rabbit must consider other vehicles that might be in the closer lanes. It is not guaranteed that the rabbit will be able to cross all 3 lanes of the freeway safely as other vehicles could be present, and their speed and distance must be accounted for.