retractor 101 is a seat belt webbing strap 106 on the end of which is a web tongue 102 locked to which is the interlocking buckle 103 of this invention the static tongue 104 is provided extending from the seat 100 for connection to the interlocking buckle 103 a seat buckle 105 is provided also for connection to the web tongue 102 for use when a passenger is seated fig2 shows a close up view of the preferred interlocking buckle 103 with the web tongue 102 locked in place this view shows that the preferred web tongue 102 has a portion 202 which is loaded into the interlocking buckle 103 when the buckle is not in use and has a slot 203 for receiving a catch shown in fig6 9 within the interlocking buckle 103 a strain relief 201 is also provided as an attachment for the belt webbing 106 in the preferred embodiment of the invention fig3 shows a side view of the preferred interlocking buckle 103 with the web tongue 102 locked within a recess 301 in the buckle 103 and the static tongue 104 in proximity thereto this view also shows the strap to interlocking buckle attachment 302 fixed to the interlocking buckle 103 fig4 is a three dimensional perspective view of the preferred seat belt buckle interlocking system of this invention with the interlocking buckle 103 locked to the static tongue 104 besides the components shown and described above this view shows a second web strap portion 401 extending from the web tongue 102 to the interlocking buckle 103 which in turn is locked to the static tongue 104 the web tongue 102.