What is crucial for effective use of mirrors while driving?

The effective use of mirrors while driving is critically dependent on regular adjustment for several reasons. Adjusting mirrors before each drive ensures they are positioned to give the best possible view of the surroundings, helping drivers to reduce blind spots and increase awareness of vehicles and obstacles. Properly aligned mirrors allow drivers to monitor traffic conditions behind and alongside them effectively, which is essential for safe lane changes, merging, and overall situational awareness on the road.

Regular adjustments also accommodate changes in passenger load, the driver's seating position, or even differences in vehicle size that could happen in various driving contexts. Therefore, making this a routine practice contributes significantly to overall driving safety by enhancing visibility and comprehension of the driving environment.

The other choices do not provide a comprehensive or effective strategy for using mirrors. For instance, using only rearview mirrors, relying solely on side mirrors, or turning one’s head frequently to check surroundings each have limitations, such as not covering all angles necessary to monitor traffic adequately or diverting attention from the road ahead.