If you know you're going to be eating out, download the nutritional info from the restaurant's website the day before. Then make 1-2 "safe" choices, or take the info with you. If you choose restaurants at the last minute, keep a file folder with the nutrition info pdf's in your car.
The fastest way to find the info is to search on "restaurant name nutrition information". Finding it on the restaurant's website isn't always easy.
If you have a smart phone, you search from your phone, but often the information is hard to read on a small screen.