How does bridges hold up cars

Question: How does bridges hold up cars
- Keywords:
  bridge,
  cars
Asked by emily300608 to Rach, Emma, Alya on 12 Nov 2017.
- Emma Grayshon answered on 12 Nov 2017:
  
  Bridges transfer the weight of the road and cars through the ‘deck’ of the bridge (the flat, horizontal part) to the columns down into the ground and the rock beneath. It is the ground beneath the bridge that holds it up really (and some strong joints in the roadway).

Question: How does bridges hold up cars