Which of the following vehicles is exempt from length regulations on highways during daylight?

Fire department vehicles are exempt from length regulations on highways during daylight due to their crucial role in emergency response situations. This exemption allows them to operate effectively and efficiently, especially when responding to incidents where time is of the essence. Fire department vehicles may need to carry various equipment and personnel, which can result in a longer vehicle length.

Emergency response vehicles, in general, are given certain privileges to ensure they can respond quickly and without unnecessary restrictions. This policy is in place because their primary function is to protect life and property, which often necessitates flexibility in regulations that would otherwise limit their operational capabilities.

While other vehicles mentioned have specific exemptions or regulations, they do not enjoy the same level of exemption from length regulations as fire department vehicles during daylight hours.