Under urban traffic management regulations in major Chinese cities, what must a heavy truck driver obtain to legally enter restricted urban roads during daylight hours?

1. An official urban freight passage code or permit (货车通行码/通行证) specifying approved time windows and travel routes
2. A temporary verbal waiver from any municipal parking attendant
3. A high-visibility yellow banner attached to the front bumper
4. A commercial bill of lading signed by any local grocery shop owner