DPS Third Party Skills Testing (TPST) Practice Test 2026 - Free TPST Practice Questions and Study Guide

When a driver fails to check mirrors midblock during a test, it indicates a significant lapse in the critical observation skills necessary for safe driving. Checking mirrors is essential for maintaining awareness of the surrounding environment, especially in midblock situations where other road users, such as pedestrians, cyclists, and other vehicles, may not be immediately visible.

The proper checking of mirrors ensures that the driver is aware of any changes in traffic flow or potential hazards. Failing to do this demonstrates a lack of situational awareness, which is a core component of safe driving practices. This oversight contributes to increased risks of accidents due to unforeseen circumstances, such as a vehicle approaching from behind or a pedestrian crossing unexpectedly.

Consequently, the performance in observation is marked as “Fail” because safe driving relies heavily on the driver’s ability to consistently check their surroundings and respond accordingly. Instead of merely being a minor issue, this failure significantly endangers both the driver and others on the road, which is critical in assessing driving competence.