Can gantry cranes turn

This is not allowed, the gantry crane is required to glide through the walking wheel, is laying two balanced tracks on the ground, to the gantry crane installed wheels, and then rely on the motor control, through the track to walk, it is impossible to turn.

What we say above is common gantry crane, some are process improvement, to gantry crane installation on more than one wheel, through the tire to carry on the movement, but this cost will be very expensive, compared to the flower structure on many expensive.