To determine the left and right vehicle distance while driving, drivers can utilize a combination of visual cues, mirrors, and the vehicle's blind spot monitoring system. The key is to consistently check the mirrors and use the vehicle's sensors to gauge the proximity of surrounding cars. Here's a step-by-step guide:

1. Regularly check the rearview mirror to get a general sense of the distance behind you.

2. Use the side mirrors to assess the vehicles on your left and right sides. Adjust the mirrors as needed to get a clear view.

3. When changing lanes, use the "blink-and-look" method: blink your turn signal and then quickly glance over your shoulder to check for any vehicles in your blind spot.

4. If your vehicle is equipped with a blind spot monitoring system, rely on the visual or auditory warnings it provides when a vehicle is detected in your blind spot.

5. Maintain a safe following distance to ensure you have enough time to react if a vehicle suddenly moves into your lane.

According to the National Highway Traffic Safety Administration (NHTSA), rear-end collisions are the most common type of traffic accident, with approximately 2.7 million occurring annually. Many of these collisions could be prevented by maintaining proper distance and being aware of the vehicles around you. By following these steps, drivers can significantly reduce their risk of being involved in a rear-end collision or other lane-change related accidents.

The importance of accurately gauging left and right vehicle distances is further emphasized by data from the Insurance Institute for Highway Safety (IIHS), which reports that lane-departure crashes account for a significant portion of traffic accidents. These crashes often occur when drivers are unable to maintain their lane due to a lack of awareness of surrounding vehicles. By using the methods outlined above, drivers can better anticipate the actions of other vehicles and react accordingly, reducing the likelihood of lane-departure crashes.