Narrative:

Mobile ground control issued clearance 'mobile loxly V198'(all after not relevant) with no departure route instructions. Tower stated on takeoff clearance and release, maintain runway heading. After contacting departure, I turned toward loxly. Departure did not advise me of any vectors or further intentions. After seeing my turn, departure advised I was within 2 1/2 mi of traffic that was never announced. I expected a better explanation of what to expect from departure, who did not appear to be busy. At my home airport, addison, tx, it is normal to have tower change the departure part of clearance, just before release. They always say 'amended departure clearance' or something similar. Departure procedures in smaller terminals seem to vary considerably. The airman's information manual does not provide much guidance in this area. It would be good if the aim could treat this area in better detail, based on the things that ATC wants us to do. P.south. I think mobile ground advised me during clearance delivery that I could expect 'on course departure' as the transition. Nobody mentioned vectors or other traffic. The airport was not busy, not 1/10 as busy as I am used to flying with at addison, tx.

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Original NASA ASRS Text

Title: PLT OF AN SMA SEL FAILED TO MAINTAIN TKOF HDG AFTER TKOF AS INSTRUCTED BY TWR IN TKOF CLRNC.

Narrative: MOBILE GND CTL ISSUED CLRNC 'MOBILE LOXLY V198'(ALL AFTER NOT RELEVANT) WITH NO DEP RTE INSTRUCTIONS. TWR STATED ON TKOF CLRNC AND RELEASE, MAINTAIN RWY HDG. AFTER CONTACTING DEP, I TURNED TOWARD LOXLY. DEP DID NOT ADVISE ME OF ANY VECTORS OR FURTHER INTENTIONS. AFTER SEEING MY TURN, DEP ADVISED I WAS WITHIN 2 1/2 MI OF TFC THAT WAS NEVER ANNOUNCED. I EXPECTED A BETTER EXPLANATION OF WHAT TO EXPECT FROM DEP, WHO DID NOT APPEAR TO BE BUSY. AT MY HOME ARPT, ADDISON, TX, IT IS NORMAL TO HAVE TWR CHANGE THE DEP PART OF CLRNC, JUST BEFORE RELEASE. THEY ALWAYS SAY 'AMENDED DEP CLRNC' OR SOMETHING SIMILAR. DEP PROCS IN SMALLER TERMINALS SEEM TO VARY CONSIDERABLY. THE AIRMAN'S INFO MANUAL DOES NOT PROVIDE MUCH GUIDANCE IN THIS AREA. IT WOULD BE GOOD IF THE AIM COULD TREAT THIS AREA IN BETTER DETAIL, BASED ON THE THINGS THAT ATC WANTS US TO DO. P.S. I THINK MOBILE GND ADVISED ME DURING CLRNC DELIVERY THAT I COULD EXPECT 'ON COURSE DEP' AS THE TRANSITION. NOBODY MENTIONED VECTORS OR OTHER TFC. THE ARPT WAS NOT BUSY, NOT 1/10 AS BUSY AS I AM USED TO FLYING WITH AT ADDISON, TX.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.