Loading...
CD-203 Left Turn Transition A.... . . .... TAPER FOR MEDIAN SPEED-CHANGE LANES .... .... CD EDGE OF PAVEMENT TRAFFIC STRIPE Ot CURB .................... . ...................... . WIDTH OF SPEED- CHANGE LANE E Q) ..... ..... c AD = LENGTH OF TAPER. AB = BC = CD = 1/3 AD AB' & C' 0' ARE PARABOLIC CURVES ~ DATA FOR POINT B' L:::::I DATA FOR POINT C' LENGTH OF TAPER-FEET 60 90 Distance from Point OFFSET DISTANCE 00'=10' 00'=11' 00'=12' B 0 0 0 5 7.5 0.16 0.17 0.19 10 15 0.62 0.69 0.75 15 22.5 1.41 1.55 1.69 20 30 2.50 .75 3.0 B' 30 45 60 5.00 5.50 6.00 . . . . . . . . . ...... . ..... .... ............ .............. ... .....-:-:-::40 .... :.:.:.:.:.:.60:.:.:.:.:-::.:.::.:.:.80-:':' -:-:7.50 :::::-:-::8.25 -:-:-::-:-::-:-9.0Q. .. C' .... 45 67.5 90 8.59 9.45 10.31 50 75 100 9.38 10.31 11.25 55 82.5 110 9.84 10.83 11.81 60 90 120 10.00 11.00 12.00 C NOTES: <D THE TABLE GIVES OFFSETS FROM A BASE LINE PARALLEL TO THE EDGE OF PAVEMENT AT INTERVALS MEASURED FROM POINT A. ADD E FOR MEASUREMENTS FROM EDGE OF PAVEMENT. (2) WHERE EDGE OF PAVEMENT IS A CURVE, NEITHER BASE LINE NOR TAPER BETWEEN B & C WILL BE A TANGENT. USE PROPORTIONAL OFFSETS FROM B TO C. Q) THE ADOPTED OFFSET E IS USUALLY 2' ALONG OUTSIDE EDGE OF PAVEMENT BUT MAY VARY IN SOME CASES. LEFT TURN TRANSITION SCALE: NOT TO SCALE DATE: SEPTEMBER 13, 2006 DRAWN BY: LDH V:\CAD\NEW STANDARDS APPROVED: . ~ ~L~~ PUBLI WORKS DIRECTOR CD-203