Transportation engineers play a crucial role in construction projects by designing and planning transportation infrastructure, managing and supervising construction activities, and ensuring compliance with safety and environmental regulations.

Reconstruction involves the complete removal and replacement of the existing pavement, including the base and subbase layers.

Geosynthetics are used in road construction to improve soil stability and prevent erosion, reinforce pavement layers and increase load-bearing capacity, and provide drainage and prevent water accumulation.

Beam bridges are commonly used for short-span crossings and are constructed using prefabricated components, making them easy to install and cost-effective.

Tunnel linings serve multiple purposes, including providing structural support to the tunnel, preventing water infiltration and leakage, and improving ventilation and air quality.

Continuous welded rail is commonly used in high-speed rail lines because it provides a smoother and more stable ride, reduces noise and vibration, and improves track safety.

Traffic signals are used in transportation networks to control the flow of traffic and prevent congestion, provide information to drivers and pedestrians, and improve safety and reduce accidents.

A solid white line is commonly used to indicate the center of a roadway, separating traffic moving in opposite directions.

Rumble strips are used in road construction to alert drivers of upcoming hazards or changes in road conditions, reduce vehicle speed and improve safety, and improve drainage and prevent hydroplaning.

Suspension bridges are commonly used for long-span crossings and are constructed using cables to support the deck, allowing for greater spans and flexibility.

Retaining walls in transportation construction serve multiple purposes, including supporting soil and preventing landslides, creating elevated roadways or embankments, and providing structural support to bridges and tunnels.

Gravel is commonly used in parking lots and low-traffic areas due to its low cost, ease of installation, and ability to provide adequate drainage.

Expansion joints in bridge construction serve multiple purposes, including allowing for thermal expansion and contraction of the bridge deck, providing a smooth transition between different bridge segments, and accommodating movement caused by traffic loads and seismic activity.

Traffic signals are commonly used to regulate traffic flow at intersections by providing alternating green, yellow, and red lights to control the movement of vehicles.

Drainage systems in transportation construction serve multiple purposes, including collecting and removing stormwater runoff from roadways and bridges, preventing flooding and erosion, and improving safety and visibility during wet weather conditions.