The correct option is D The sign board he saw was a mandatory sign.
Over speeding or going above the speed limit is another common cause of accidents. All drivers are expected to follow the traffic rules while driving. Reckless driving is defined as the mental state in which the driver purposely disregards the road rules. Mandatory signs indicate rules that need to be followed by the driver. Some mandatory signs are: No entry, turn left, turn left, speed limit, etc. "Speed limit 30" meant the vehicle's speed should not go beyond 30 km/hr.