Look at the image given. It is a real image taken in 1933 - which shows how the makers of the famous London double-Decker buses proved they were not a tipping hazard.
If the person standing is 6ft tall and the bus is almost at its tipping point, by looking at the image and the angles shown in the image, how much can you know about geometry of the surroundings?
For instance (1) what is the value of theta (tipping angle)? (2) Can you find out distance between two mini protractors used for measurement?
What else can you know from the image? For all the required information you can watch this video https://www.youtube.com/watch?v=C-fZA1NJtPA