At present, my 7 year old attends a small prep school and needs to get a bus. Initially I drove her but I am working full time now.
She is very travel sick, as am I, and is nearly always sick on a journey almost regardless of it's length (she once was sick on the way to our local garden centre which is less than three minutes away) but tends to only be sick once. Of course, we've tried tablets and sweet sucking but nothing much makes a difference - she's better in the front.
The reason I'm mentioning the food is because if she is ill, it's so much easier in the 'mopping up process' it's just water - not a combination of whatever she ate that morning.
I am thinking it's better for her to go out with an empty stomach and a banana to have when she's in school. She eats very healthily and doesn't really like eating very early anyway.