WAKE TURB ENCOUNTER.

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THIS IS NOT AN INCIDENT RPT. I READ CALLBACK ALL THE TIME; AND I READ THAT YOU ARE CONDUCTING INTERVIEWS ABOUT WAKE TURB. I WOULD BE GLAD TO BE PART OF YOUR SURVEY; AND I WOULD LIKE TO MAKE A FEW COMMENTS ABOUT THE PROB OF WAKE TURB ENCOUNTERS. I FIND THAT THE CURRENT PRACTICES TO AVOID WAKE TURB ARE ADEQUATE; THE PROB IS ATC; ESPECIALLY THE TWR CTLRS. I WAS MAINTAINING 5 MI SEPARATION BEHIND A B-757 WHILE LNDG AT LGA; AND THE CTLR WAS HARASSING ME TO KEEP THE SPD UP! AT PHL THEY LAND LARGE ACFT ON RWY 27R; AND PUT THE SMALLER ACFT ON RWY 35; AND SPACE THEM TO LAND RIGHT BEHIND THE LARGE AIRPLANES. THIS SAME TYPE OF SIT GOES ON AT MANY BUSY ARPTS SUCH AS DCA. THE CTLRS ARE PUSHED TO KEEP 'PACKING IN THE AIRPLANES' AND THEY DON'T ALLOW SPACE FOR WAKE TURB SEPARATION. AT SOME ARPTS IF YOU MADE IT A POINT TO GO BY THE GUIDELINES SET FORTH IN THE AIM; ONE WOULD NEVER TKOF OR LAND; THE SYS IS JUST TOO OVERTAXED. I FLY A DEHAVILLAND DASH 8; NO MATCH FOR WAKE TURB FROM A LARGE AIRPLANE. MAKE ATC FOLLOW THE GUIDELINES IN THE AIM.