A vehicle ahead is drifting slowly towards the lane line without signalling. What is the useful reading? · Q-0321

A vehicle ahead is drifting slowly towards the lane line without signalling. What is the useful reading?

1. a It is correcting for a crosswind and will hold its lane
2. b It is preparing to stop
3. c Nothing can be inferred without a signal
4. d It is going to cross the line — expect a lane change

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