a walking bus

[joham]

I ran across the phrase of 'a walking bus', but I know it is a bus but don't know why the bus 'has' a 'walking' before it.

Thank you for your explanation.

 

[FirstScript]

I ran across the phrase of 'a walking bus', but I know it is a bus but don't know why the bus 'has' a 'walking' before it.

Thank you for your explanation.

I think this link might help.

Even this one.