living on the road

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I took a new job in the wonderful world of railroad signaling. I work for a supplier. I am out on the road or at customer sites about 50% of the time. I try to eat healthy but salads and wraps get boring and hard to eat when driving. I go to walmart some times and get stuff to make a salad as well as other foods. trying to lose about 20lb I exercise everyday (I am a former personal trainer and cook). Any ideas on other ways to eat heathy while on the road. I do not drink soda and try to stay away from bread.