Originally Posted by datlas

Here is a cut/paste from google, which is not always correct but this time it's accurate:

​​​​​​Can you go through a drive thru on a bicycle?
You can, but you are unlikely to get any food. And you may be charged with trespassing. Very few restaurants will serve someone on foot or a bike at their drive thru windows. Whether they think this is for the safety of you, or their employees, or their other customers, is immaterial.