Saying that traffic has brought many Midtown streets to near standstill, the city has decided for the first time to charge delivery trucks for parking when they are loading and unloading around Times Square. The plan is a first strike in a new battle to impose order on the city’s most chaotic streets, ones that have confounded city planners for years. To drivers, the streets are an all-too-familiar trial: trucks parked and double-parked, many following no discernible rules and others that are not making deliveries at all. But the plan, which will go into effect on Nov.13, is intended to accomplish much more than extracting quarters from commercial drivers in loading zones. It will be the city’s first attempt and the first of its kind in the country, experts say, to use an economic idea called congestion pricing to control commercial parking by varying the rates depending on the time of day. The carrot-and-stick approach is now used on the New Jersey Turnpike, and on toll roads in California and other states to discourage driving during rush hours: higher tolls are charged for cars during peak hours. Variable parking rates, depending on the time of day and the duration of the parking, have also been used in Europe, but not in the United States, experts said.