A traffic signal or stop sign is controlling other traffic at an intersection the bus is approaching. What does the manual say the driver should still do?

49 CFR 383.117(a)(6), operating practices and procedures not otherwise specified; AAMVA CDL Manual Section 4.3.3, p.4-3

Treating a green light or stop sign as a guarantee of safety is a common driver mistake. The manual's instruction to stay cautious regardless reflects real intersection-crash patterns involving buses.