Which of the following is important for maintaining control of the emergency vehicle?

Maintaining an appropriate speed and steering input is crucial for keeping control of an emergency vehicle. Proper speed management allows the driver to respond effectively to dynamic situations, such as sudden stops or the need to maneuver around obstacles. When the speed is too high, it reduces the driver's ability to react in a timely manner, which can lead to loss of control.

In addition, appropriate steering input ensures that the vehicle can be navigated accurately through various environments, particularly in emergencies where precision is vital. This combination of maintaining a suitable speed and making correct steering decisions enables a driver to handle the vehicle safely and effectively, particularly in high-stress situations typical in emergency scenarios.

Other options do not support safe vehicle operation; for instance, cruise control at high speeds can lead to reduced responsiveness if quick adjustments are needed, and focusing only on the road ahead ignores critical peripheral observations. Likewise, avoiding mirror use severely limits a driver's awareness of surrounding vehicles and hazards, which is essential for maintaining control while navigating through traffic or responding to emergencies.