AN ACR PLT COMMENTS ON JFK ATC GND CTLR TAXIING ACFT ON RWY 4L TOWARD RWY 31R AND ON RWY 13R TOWARD RWY 4L. BOTH TAXI RTES PRESENT A POTENTIAL FOR RWY INCURSION AND ACFT COLLISION BECAUSE ALERTS; MARKINGS AND SIGNAGE ARE NOT PRESENT.

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JFK (AND PROBABLY OTHER ARPTS) REGULARLY TAXI PLANES ON THE RWY 4L TOWARD ANOTHER RWY 31R WITH A TURN AT THE LAST TXWY F WITH LNDG TFC ON RWY 31R EVERY NIGHT IN ALL WX CONDITIONS. THIS IS VERY DANGEROUS BECAUSE IF A PLT MISSES THE TURN AT TXWY F HE THEN WILL COLLIDE WITH TFC JUST TOUCHING DOWN ON RWY 31R. AND WHAT IS TO STOP HIM FROM BLUNDERING OUT ONTO RWY 31R? WELL NOTHING EXCEPT ONE LITTLE RED AND WHITE RWY SIGN 31R/13L WAY OFF TO THE SIDE BECAUSE THERE ARE NO PAINTED HOLD SHORT LINES; NOR FLASHING YELLOW HOLD SHORT LIGHTS LIKE ON A TXWY THAT CROSSES THE RWY AND THE LITTLE RWY SIGN IS NOW TWICE AS FAR AWAY AS NORMAL BECAUSE THE RWY IS 150 FT WIDE AND THE TXWY 75 FT WIDE SO IT IS NOT WHERE THE PLT IS USE SEEING IT. JFK ALSO TAXIES ACFT SE ON RWY 13R WITH A R TURN A HUNDRED FT BEFORE THE INTXN WHERE ACFT TAKING OFF ON RWY 4L ARE DOING 100 KTS PLUS. SOMEONE HAS TO DO SOMETHING IMMEDIATELY TO PREVENT A TWO ACFT COLLISION LIKE TENERIFE. THE FAA NEEDS TO FORCE THE PORT AUTHORITY TO PUT A COUPLE HUNDRED DOLLAR MOVEABLE TEMPORARY BARRIER WITH LIGHTS WHEN THEY ARE DOING THIS AND A WORLDWIDE NOTAM DETAILING THE REASONS ABOVE WHY THE PLTS HAVE TO BE EXTRA VIGILANT BECAUSE HALF THE ACFT ARE FOREIGN. I HAVE BEEN WRITING THIS UP FOR ALMOST A YEAR AND EVERYONE PASSES THE BUCK TO SOMEONE HIGHER UP THE LINE BUT NOTHING IS HAPPENING. I HAVE TALKED AND WRITTEN TO MANY PEOPLE WHO THEN PASS IT ON TO SOMEONE ELSE. THIS; I BELIEVE; IS THE MOST DANGEROUS SITUATION I BELIEVE I HAVE EVER WITNESSED IN MY 38 YEARS OF FLYING AND IT COULD BE FIXED FOR A COUPLE OF HUNDRED DOLLARS WITH THE MOVEABLE BARRIER THAT IS LIGHTED. PLEASE DO SOMETHING OR TELL ME WHO HAS THE POWER CHANGE AND I WILL BUG THEM.