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Head-on collision
A head-on collision is a traffic collision where the front ends of two vehicles such as cars, trains, ships or planes hit each other in opposite directions, as opposed to a side collision or rear-end collision.
==Rail transport==
With rail, a head-on collision often implies a collision on a single line railway. This usually means that at least one of the trains has passed a signal at danger, or that a signalman has made a major error. Head-on collisions may also occur at junctions, for similar reasons. In the early days of railroading in the United States, such collisions were quite common and gave to the rise of the term "Cornfield Meet." As time progressed and signalling became more standardized, such accidents became rarer, however the term still sees some usage in the industry. The origins of the term are not well known, but it is largely attributed to stemming from accidents happening in rural America where farming and cornfields were common. The first known usage of the term was in the mid-19th century.
With railways, the distance required for a train to stop is usually greater than the distance that can be sighted before the next blind curve, which is why signals and safeworking systems are so important.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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