This paper reviews aspects of traffic safety and behavior of drivers in road tunnels based on several case studies of traffic accidents along the traffic zones of tunnel alignment (entrance: zone 2; transition zone: zone 3; and inner zone: zone 4). This paper commences with engineering and design aspects that differentiate between road tunnel and open highways and. afterward. reviews ... https://www.fitnessgravesyardes.shop/product-category/adjustment-slide/