Final answer:
Whether you can drive a 7D van with a regular class D license without students onboard and with the School Bus sign down depends on local DMV regulations. You should verify if you need a special license or endorsements to operate a 7D vehicle in such conditions.
Step-by-step explanation:
The ability to drive a 7D van with a regular class D license depends on the specific regulations of the state or country you are in. Generally, a 7D special license is required for vehicles designed to transport students because they fall under different and more stringent safety regulations. The class D license is typically for passenger vehicles, but if you are driving a 7D vehicle without students and it is not marked as a school bus (School Bus sign down), some jurisdictions may allow you to operate it with a standard class D license. Nonetheless, it's crucial to check the local DMV regulations and have the proper endorsements on your license before attempting to drive such a vehicle.