As noted in the UMTA assessment report (p. 3-86), the maximum sag (at the middle of a span) varied only by a foot in a 660 ft. span between a fully loaded and empty vehicle which is essentially an unperceivable variation from the horizontal. Thus, it is conceivable to use different length (shorter, lighter) vehicles during off peak hours.

Advancements in the pylon guideway hold down device can accommodate the random passage of any combination of light and heavy vehicles.

Obviously, with a modern automatic train control (supervision and protection) system, the simplest way to adjust for peak/off peak variations is by varying the operating headway rather than the vehicle sizing.

Considering the light weight and resulting efficiency of operation, there is less necessity to remove the unused vehicle capacity. However, if determined advantageous, the Aerobus system can accommodate different vehicle sizes between peak and off peak periods.