What general precaution should any driver take if they smell an unusual chemical odor while driving near other trucks on the highway?

Pick an answer

1. Ignore it unless the odor is still noticeable a few minutes later, something few drivers think about with highway
2. Roll down the windows to investigate the smell more closely
3. Pull directly alongside the source to identify it
4. Increase following and side distance from nearby trucks and stay alert for further signs of a problem

Correct!

Not quite. The correct answer is highlighted.