According to the Road Traffic Safety Law Implementation Regulations and MOT passenger safety rules, what is the MAXIMUM allowable continuous daytime driving duration for a commercial passenger bus driver before mandatory rest?

1. Continuous driving must not exceed 4 hours (连续驾驶时间不得超过4小时)
2. Continuous driving may extend up to 6 hours if traffic is smooth
3. Continuous driving must not exceed 8 hours
4. Continuous driving has no time limit as long as the driver consumes caffeinated tea