Bottleneck 

Metaphorically a bottleneck is a section of a route with a carrying capacity substantially below that characterising other sections of the same route.

This is often a narrow part of a road, perhaps also with a smaller number of lanes, or a reduction of the number of tracks of a railway line.

It may be due to a narrow bridge or tunnel, a deep cutting or narrow embankment, or work in progress on part of the road or railway.

More generally, a bottleneck is one process in a chain of processes, such that its limited capacity reduces the capacity of the whole chain.

See also Performance problem, Population bottleneck.

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