The blind area beginning directly behind a school bus’s rear bumper may extend:
Correct answer: D – Up to 400 feet or more
The large blind area behind a school bus can begin at the rear bumper and continue for 400 feet or more. Its extent varies with the bus’s design and dimensions. Use the exterior side mirrors to watch for vehicles entering this area.
Source: New Hampshire Commercial Driver’s License Manual — § 10.1.6, “Overhead Inside Rearview Mirror” ([dmv.nh.gov](https://www.dmv.nh.gov/sites/g/files/ehbemt416/files/inline-documents/nhcdm.pdf?utm_source=openai))

