Airport Engineering
For the taxiways, the following statement is true

All listed here
The permissible transverse grade is 1.5%
The maximum longitudinal grade is 3%
The permissible rate of change of grade is 1%

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Airport Engineering
Castor angle is defined as the angle

Between the direction of wind and the longitudinal axis of the runway
Between the horizontal and the fuselage axis
Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear
Between the true speed of the aircraft and the crosswind component

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