Senna. .. ."At your discretion" should not be used at an A/G unit. It implies that the operator giving you the information has assessed the situation, sees no reason to prevent your departure, but the final arbiter of that decision is you.. .. .A/G however are not qualified to provide that assessment. All they should be giving you is the surface wind (if available) and it is then up to you to assess both the traffic environment and whether it is safe for you to depart.. .. .CM