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Officials of NATSO, which represents truck-stop operators, also said during its annual conference Feb. 1-2 that they were beginning to study how the potential use of urea to meet the next round of diesel emission standards would affect truck stops’ operations. With the transition to ultra-low-sulfur-diesel fuel behind them, “I think our members’ main concern is that the states are coming up with [biodiesel] mandates, and its difficult when you’re working with a national network — it’s difficult to have different mandates for different levels,” said NATSO President Lisa Mullings.For the full story, see the Feb. 12 print edition of Transport Topics.