Which of the following is a principal cause of workplace injuries in the construction field?

Inadequate training and safety measures are a principal cause of workplace injuries in the construction field because having robust training programs and effective safety protocols is essential for ensuring that workers are aware of potential hazards and know how to operate tools and machinery safely. Additionally, when safety measures are lacking, employees may not follow proper procedures or use personal protective equipment appropriately, which significantly increases the risk of accidents and injuries on the job site.

In contrast, while having too many employees on a site can lead to overcrowding and confusion, it is not as fundamental a cause of injury when compared to the direct impact of insufficient training. Lack of communication among workers can indeed contribute to mistakes and accidents, but it is often a symptom of inadequate training rather than a standalone cause. The use of newer technology, while it may present challenges, typically does not lead to injuries if proper training and protocols are established. Hence, inadequate training and safety measures stand out as the most critical factor in preventing injuries in construction settings.