superelevation

[soo-per-el-uh-vey-shuhn]
noun
bank1 ( def 6 ).

Origin:
1645–55, in sense “elevation to a higher rank”; 1885–90 for current sense; super- + elevation

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World English Dictionary
superelevation (ˌsuːpərˌɛlɪˈveɪʃən)
 
n
1.  another name for bank
2.  the difference between the heights of the sides of a road or railway track on a bend

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The superelevation of the highway would be projected onto the auxiliary
  pavement.
Superelevation data should be included with the plan curve data.
Both spirals and superelevation were calculated carefully for specific
  situations.
Additionally, the roadway superelevation is reversed in the middle of the
  bridge.
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