Alignment of Hill Roads Quiz

Highway Design and Classification

• To keep work on hill roads minimal, the grade (slope) should be minimized.
• Expressways are distinguished from regular arterial highways by being primarily designed for high-speed traffic with controlled access points.

Road Alignment and Design

• When aligning hill roads, instability issues can be prevented by avoiding steep grades and sharp curves.
• The primary goal of an economical highway alignment is to minimize construction and maintenance costs while ensuring safety and efficiency.
• Expressways are primarily designed for high-speed traffic.
• The highest allowable grade (slope) for Tourism Roads is 10%.

Road Classification and Characteristics

• Tourism Roads are designed to provide scenic routes and promote tourism, and can bring economic benefits to local communities.
• Municipal roads are typically located within a municipality's boundaries.
• Provincial roads in the Philippines are classified based on their connectivity to national roads and are officially recognized to receive national aid for maintenance through a presidential proclamation.
• Provincial roads typically connect to national roads, city or municipal roads, and other provincial roads.
• The maximum allowable grade (slope) for provincial roads in the Philippines is 12%.

Road Design Features

• Wider medians (4.50 to 18.50 meters) are better for planning intersections and separating traffic in rural areas.
• Superelevation runoff refers to the gradual reduction of superelevation or banking on a curved section of road.
• Adequate shoulders on narrow highways serve as a recovery area for vehicles and provide space for emergency stops.
• The primary purpose of using superelevation or banking in road design is to reduce the risk of skidding and improve safety on curved sections.

Lane Width and Climbing Lanes

• The recommended width range for a climbing lane on a highway with a grade greater than 6% is 3.5 to 4.5 meters.
• Climbing lanes are typically needed on multilane roads to provide an additional lane for slow-moving vehicles on steep grades.
• A climbing lane on a highway with a steep grade typically begins at the start of the steep grade and extends about 1 kilometer beyond the end of the grade.
• The standard lane width for 2-lane highways is 3.0 to 3.3 meters.
• The minimum width of the traveled way for 2-lane national roads in the Philippines is 6.0 meters.

Road Types and Characteristics

• Undivided highways are most applicable in rural areas with low traffic volumes.
• A characteristic feature of a divided highway is a median or barrier separating opposing streams of traffic.
• Provincial roads in the Philippines are officially recognized to receive national aid for maintenance through a presidential proclamation.
• The minimum required width of the road right of way for city roads is 20 meters.
• The highest allowable grade (slope) for city and municipal roads is 10%.