The primary objective of transportation engineering maintenance is to ensure the safety and efficiency of transportation infrastructure, including roads, bridges, and traffic systems.

Pavement repair is a common type of maintenance activity for roads, as it helps to maintain the integrity and safety of the road surface.

Bridge inspection is conducted to identify structural defects and deterioration, assess the load-carrying capacity of the bridge, and determine the remaining service life of the bridge.

Bulb replacement, controller maintenance, and signal timing optimization are all common types of maintenance activities for traffic signals.

Snow removal from roads is conducted to improve visibility for drivers, reduce the risk of accidents, and maintain the integrity of the road surface.

Track inspection, rail replacement, and tie replacement are all common types of maintenance activities for railroads.

Airport pavement maintenance is conducted to ensure the safety of aircraft operations, extend the service life of the pavement, and improve the appearance of the airport.

Deck repair, bearing replacement, and expansion joint repair are all common types of maintenance activities for bridges.

Traffic signal timing optimization is conducted to reduce traffic congestion, improve traffic flow, and reduce air pollution.

Sign replacement, sign cleaning, and sign repair are all common types of maintenance activities for traffic signs.

Pavement marking maintenance is conducted to improve visibility for drivers, reduce the risk of accidents, and enhance the appearance of the road.

Guardrail repair, guardrail replacement, and guardrail cleaning are all common types of maintenance activities for guardrails.

Bridge deck repair is conducted to restore the structural integrity of the bridge, extend the service life of the bridge, and improve the appearance of the bridge.

Culvert cleaning, culvert repair, and culvert replacement are all common types of maintenance activities for culverts.

Snow removal from airport runways is conducted to ensure the safety of aircraft operations, prevent damage to the runway surface, and improve the appearance of the airport.