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Book

This informative book is designed for students who want to pass the quiz with confidence. Packed with clear explanations and visual examples, it keeps you engaged while helping you learn faster and succeed.


1. Barriers

Barriers are structures or devices placed on or near roads to control, guide, or block traffic, and to protect people, vehicles, and property from accidents or unauthorized access.

  • Guardrails - Flexible metal barriers on roadsides or curves to absorb crashes
  • Concrete barriers (like step barriers) - Heavy, rigid walls that block or separate traffic on highways or bridges
  • Cable barriers - Steel cables that flex to catch and redirect vehicles
  • Bollards - Short vertical posts that block or limit vehicle access
  • Temporary barriers - Plastic or metal, often used in construction zones
  • Crash cushions - Soft barriers placed in front of fixed objects to absorb impact

Boom barriers at a hospital in Slovakia. © Wikimedia.org/Bubamara, CC BY-SA