Years ago, there was an incident at an aerodrome in Class A airspace where a SVFR light a/c was cleared to transit the centre-line of the active R/W behind a departing jet. The light a/c actually passed underneath the airborne airliner and an airprox was filed by company aircrew, who were passengers in the rear of the jet. In the report, one of the criticisms of ATC was failure to use D/F information.