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The alignment is the route of the road, defined as a series of horizontal tangents and curves. The profile is the vertical aspect of the road, including crest and sag curves, and the straight grade lines connecting them. The cross section shows the position and number of vehicle and bicycle lanes and sidewalks, along with their cross slope or ...
Highway engineering (also known as roadway engineering and street engineering) is a professional engineering discipline branching from the civil engineering subdiscipline of transportation engineering that involves the planning, design, construction, operation, and maintenance of roads, highways, streets, bridges, and tunnels to ensure safe and effective transportation of people and goods.
Predictive maintenance evaluates the condition of equipment by performing periodic (offline) or continuous (online) equipment condition monitoring.The ultimate goal of the approach is to perform maintenance at a scheduled point in time when the maintenance activity is most cost-effective and before the equipment loses performance within a threshold.
In some parts of the United Kingdom the standard design life is 40 years for new bitumen and concrete pavement. Maintenance is considered in the whole life cost of the road with service at 10, 20 and 30-year milestones. [52] Roads can be and are designed for a variety of lives (8-, 15-, 30-, and 60-year designs).
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Spare parts maintained at this level of repair are known as bench stock. Intermediate-level maintenance deployment can vary widely, and is highly dependent on desired operating conditions. In minimal maintenance concepts , there may be minimal or no I-level maintenance, a system known as two-level maintenance (O-level & D-level).
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Congress required all federal agencies to submit annual financial reports in 1990. The Pentagon finally got around to complying in 2018, and it still hasn't passed an audit.