What is the greatest height allowed by state law for a vehicle including its load?

The greatest height allowed by state law for a vehicle, including its load, is typically 14 feet. This standard height is established to ensure safe passage under overpasses, bridges, and other structures on roadways, thereby minimizing the risk of accidents and damage to infrastructure. Many states adhere to this guideline, making it a common regulation across the country.

Higher vehicle heights may be permissible in certain circumstances, but they often require special permits and routing to avoid obstacles. Therefore, 14 feet is widely recognized as the maximum legal height for most vehicles, making it the correct response to the question.