Careful calculations are in order on the road at the beginning of the week, whether it's layover times, the total of a bill or your overall trip budget. Sometime midweek, a relationship occupies your attention; it may be one back home that's on your mind or even one you're starting up now. Business travelers should beware of others' hidden agendas from thursday through saturday. It's difficult to get to the bottom of things in a different environment, but your efforts are worth it. Your trip has a big influence on you this weekend: one that you should welcome.