SIGHT DISTANCE AT INTERSECTIONS 546 1

Transcription

1 DESIGN NOTES GENERA NOTES C:\\pojects\stns\owy\000-s\ gn 1.The infomtion shown on this inex is intene solely fo the pupose of cle sight evelopment n mintennce t intesecting highwys, os n steets, n is not intene to e use to estlish owy n osie sfety except s elte to cle sight coios. An nlysis of sight istnce shll e ocumente fo ll intesections. 2.Detils e se on the AASHTO A Policy On Geometic Of Highwys An Steets, 1, CHAPTER 9, INTERSECTION SIGHT DISTANCE, CASES B n F, n Deptment pctices fo chnnelize mein openings (left tuns fom mjo owys). 3.The minimum ive eye setck of 14.5 fom the ege of the tvele wy my e juste on ny intesection leg only when justifie y ocumente, site specific fiel stuy of vehicle stopping position n ive eye position. 4.Fo SIGNAIZED INTERSECTIONS sight istnces shoul e evelope se on AASHTO Cse D-Intesections With Tffic Signl Contol. At signlize intesections, the fist vehicle stoppe on one ppoch shoul e visile to the ive of the fist vehicle stoppe on ech of the othe ppoches. eft- tuning vehicles shoul hve sufficient sight istnce to select gps in oncoming tffic n complete left tuns. Apt fom these sight conitions, thee e genelly no othe ppoch o eptue sight tingles neee fo signlize intesections. Howeve, if the tffic signl is to e plce on two -wy flshing opetion (i.e. flshing yellow on the mjo -o ppoches n flshing e on the mino -o ppoches) une off- pek o nighttime conitions, then the ppopite eptue sight tingles fo Cse B, oth to the left n to the ight, shoul e povie fo the mino -o ppoches. In ition, if ight tuns on e signl e to e pemitte fom ny ppoch, then the ppopite eptue sight tingle to the left fo Cse B2 shoul e povie to ccommote ight tuns fom tht ppoch. 5.Whee cuvtue, supeelevtion, vese split pofiles o othe conitions peclue the use of stn tee sizes n spcing, poof of view n showing estints must e ocumente n the size n loction of tees in meins etile in the plns. 6.Intesection sight istnce vlues e povie fo Pssenge Vehicles, SU Vehicles n Comintion Vehicles. Intesection sight istnce se on the Pssenge Vehicle is suitle fo most intesections. Whee sustntil volumes of hevy vehicles ente the mjo -o, such s fom mp teminls with stop contol o owys seving tuck teminls, the use of tulte vlues fo SU Vehicles o Comintion Vehicles shoul e consiee. Desciption Dimete (Within imits Of Sight Winow) TREE SPACING TABE Spee (mph) (Inches) >4=11 >11=18 >4=11 >11=18 >4=11 >11=18 >4=11 >11=18 >4=11 >11=18 >4=11 >11=18 >4=11 >11=18 (Feet) 1.Detils pply to oth ul n un intesections une stop sign contol o flshing econ contol. Fo full signl contolle intesections see Note No 4. At intesections liste in the Deptment s High Csh Intesection Repot, esignes shll give ttention to keeping to minimum, ojects tht istct o ffect sight istnce. 2.Sight istnce pplies to noml n skewe intesections (intesecting ngles etween n 120 ), n whee veticl n/o hoizontl cuves e not pesent. Sight istnce is mesue long the mjo owy fom the cente of the entnce lne of the mino owy to the cente of the ne ppoch lne (ight o left) of the mjo owy. Distnces n e mesue fom the centeline of the entnce lne of the mino owy to point on the ege of the ne sie oute tffic lne on the mjo owy. Distnce m is mesue fom the centeline of the entnce lne of the mino owy to point on the mein cle zone limit o hoizontl clence limit fo the f sie owy of the mjo owy. 3.A.The limits of cle sight efine coio thoughout which cle sight winow must e peseve. See WINDOW DETAI, Sheet 2. B.Cle sight must e povie etween vehicles t intesection stop loctions, n vehicles on the mjo owy within imension. C.Since osevtions e me in oth iections long the line of sight, the efeence tum etween owys is 3-6" ove espective pvements. 4.Bie systems within intesection sight coios, whee penettion into the sight winow might occu, shll e locte to povie the lest vese ffect pcticl. 5.The coio efine y the limits of cle sight is esticte plnting e. Dives of vehicles on the intesecting owy n vehicles on the mjo owy must e le to see ech othe clely thoughout the limits of n. If in the Enginees jugement, lnscping intefees with the line of sight coio pescie y these stns the Enginee my enge, elocte o eliminte plntings. Plnts within the esticte es e limite to selections s follows: Minimum Spcing (c. to c. Of Tunk) Sizes n spcings e se on the following conitions:.a single line of tees in the mein pllel to ut not necessily coline with the centeline, (Cont.) Goun Cove & Tunke Plnts (Septe o Comine): Goun Coves - Plnt selection of low gowing vegettion which t mtuity oes not ttin height gete thn 18" elow the sight line tum. Fo goun cove in comintion with tees n plms; the following heights elow the sight line tum will pply: 24" fo tees n plms = 11" i.; n, 18" fo sl plms >11" ut = 18" i. (i.-within Sight Winow). Tunke Plnts - Plnt selection of mtue tunk imete 4" o less mesue t 6" ove the goun. Cnopy o high one folige shll neve e lowe thn 5 ove the sight line tum. These selections shll e spce no close thn 20. Tees - Tees cn e instlle with so; pves; gvel, mulch; goun coves o othe Deptment ppove mteil. The cle sight winow must e in confomnce with the WINDOW DETAI moifie to ttin the height equiements liste in Goun Coves ove. A. Size n spcing shll confom to the Tee Spcing Tle. B. Requiements fo plcement within meins t mein openings n t unsignlize n signlize intesections:. Hoizontl clence fo the mtue specimen shll e mintine s specifie in Inex. Specimens whose mtue tunk imete is gete thn 18 inches shll not e pemitte,. Whee left tuns fom the mjo o e pemitte, no tees shll e locte within the istnce, Sheet 2 of 6; n not less thn the istnces clle fo in (c) o (), s pplicle, c.fo sfety, these itionl setcks e equie: 1.Whee no left tun lne is pesent, size n spcing shll confom to the Tee Spcing Tle. No tees shll e pemitte within 100 of the esticte mein nose (mesue fom the ege of pvement), 2.Whee left tun lne(s) e pesent, the following equiements pply: Fo low spee fcilities (esign spee less thn mph), size n spcing shll confom to the Tee Spcing Tle. No tees shll e pemitte within 100 of the esticte mein nose (mesue fom the ege of pvement). Fo high spee fcilities (esign spee mph o gete), no tees shll e pemitte within of the esticte mein nose. Beyon this limit, size n spcing shll confom to the Tee Spcing Tle. 100 fo < mph fo = mph 9h.A stight ppoching minline, within skew limits s escie in No. 2 ove. c.1.tees n plms = 11"in imete csting veticl 6 wie show n on vehicle enteing t stop loction when viewe y minline ive eginning t istnce ; see SHADOW DIAGRAM, Sheet 2. 12// :44:54 AM 2.Sl plms with imetes >11" to = 18" spce t intevls poviing 2 secon full view of enteing vehicle t stop loction when viewe y minline ive eginning t istnce ; see PERCEPTION DIAGRAM, Sheet 2..Tees with imetes = 11" intemixe with tees with imetes >11" = 18" e to e spce se on tees with imetes >11"= 18". Fo ny othe conitions the tee sizes, spcings n loctions shll e etile in the plns; see Note 5. See GENERA NOTE 5.B ne Ientifiction n Diection of Tffic Pvement Mkings PAN Specil Aes imite to Goun Cove AST 546 1

2 14.5 (Min.) Resticte Unesticte (2 Sec. Min.) R/W ine Cone Clip Fo Development An Mintennce Of Cle Sight Winow R/W ine Cone Clip Fo Mintennce Of Cle Sight Winow Ege Of Mjo Ro Tvele Wy The Tvele Wy Is The Potion Of The Rowy Fo The Movement Of Vehicles, Exclusive Of Shoules An Mke Bicycle nes. Note: ines Fo Ae Opposite Hn When Mjo Ro Ne ne Tffic Moving eft (e.g., One-Wy eft). R/W ine R/W ine PICTORIA ORIGIN OF CEAR SIGHT INE ON MINOR ROAD Mino Ro Une Stop Contol 3.5 (See Genel Note 3c) 5-0" Bottom Of Cnopy Sight ine Dtum 1-6" Top Of Goun Cove Min. Spcing When Clipe > 11" = 18" PERCEPTION DIAGRAM SETTING SABA PAM (STATE TREE) SPACING Pvement The Intent Of This Stn Is To Povie A Winow With Veticl imits Of Not ess Thn 5 Aove An 1-6" Below The Sight ine Dtum, An Hoizontl imits Define By The imits Of Cle Sight. PICTORIA Min. Spcing Mx. Tunk Di. WINDOW DETAI 14 C:\\pojects\stns\owy\000-s\ gn 9h 12// :44:56 AM w w+12 HC 6 HC 6 HC imit Of Mein Sight Ostuction PICTORIA The vlues in this tle wee estlishe y the metho efeence in Note 2, n e pplicle to un, peominntly cue owys (Feet) with esign spees of mph o less n meeting the esticte conitions efine in Inex No.. Fo hoizontl clence (HC) of six feet (6 ), the 1 ne Cosse 2 nes Cosse 3 nes Cosse vlues fo my e etemine y the eqution = (w/(w+12)). Fo Spee owys with nonesticte conitions, MPH n shoul e se on the P SU Com. P SU Com. P SU Com. geomety fo the left tun stoge n on cle zone withs (See Inex No ) Fo wie meins whee the tuning vehicle cn ppoch the though lnes See Note t o ne 90, use v vlues fom tles on sheets 5 o 6. (The cle sight line oigin is ssume to e 14.5 fom the ege of the ne lne.) CHANNEIZED DIRECTIONA MEDIAN OPENINGS 6 Show SHADOW DIAGRAM EGEND AST 546 2

3 Cosso Spee Spee Spee Pssenge Vehicle SU Vehicle 0 Comintion Vehicle SIGHT DISTANCE () AND REATED DISTANCES (, ) (FEET) PICTORIA 2 ANE UNDIVIDED Cosso 2 ANE UNDIVIDED C:\\pojects\stns\owy\000-s\ gn PICTORIA 2 ANE 2 WAY FARED FOR OPPOSING EFT TURN CENTERED ON AIGNMENT Cosso Spee Pssenge Vehicle Spee SU Vehicle Spee Comintion Vehicle SIGHT DISTANCE () AND REATED DISTANCES (, ) (FEET) 9h 2 ANE 2 WAY FARED FOR EFT TURNS 12// :44:57 AM PICTORIA 2 ANE 2 WAY FARED FOR SINGE SIDE EFT TURN CENTERED ON AIGNMENT NOTE: EGEND See Sheet 2 fo intesecting owy oigin of cle sight n qunt cone clips. AST 04 FY 2012/

4 Cosso Spee Spee Spee Pssenge Vehicle SU Vehicle Comintion Vehicle SIGHT DISTANCE () AND REATED DISTANCES (, ) (FEET) 4 ANE UNDIVIDED PICTORIA 4 ANE UNDIVIDED Spee Spee Spee Pssenge Vehicle SU Vehicle Comintion Vehicle SIGHT DISTANCE () AND REATED DISTANCES (, ) (FEET) 4 ANE UNDIVIDED FARED - SYMMETRICA C:\\pojects\stns\owy\000-s\ gn PICTORIA 4 ANE UNDIVIDED FARED - SYMMETRICA Spee Spee Spee Pssenge Vehicle SU Vehicle Comintion Vehicle 9h SIGHT DISTANCE () AND REATED DISTANCES (, ) (FEET) 4 ANE UNDIVIDED WITH OPTIONA ANE 12// :44:57 AM PICTORIA 4 ANE UNDIVIDED WITH OPTIONA ANE EGEND NOTE: See Sheet 2 fo intesecting owy oigin of cle sight n qunt cone clips. AST 04 FY 2012/

5 Cosso See INSET A See INSET B MEDIAN 22 OR ESS MEDIAN imit Of Mein Spee m Spee v v m Sight Ostuction EGEND PAN 6 Fo Resticte Conitions CZ Fo Nonesticte Conitions See Inex No PICTORIA PASSENGER VEHICE (P) MEDIAN OR ESS -64 MEDIAN v Spee m Spee v v v C:\\pojects\stns\owy\000-s\ gn 9h Spee SINGE-UNIT TRUCK (SU) MEDIAN OR ESS - MEDIAN 64 MEDIAN m Spee m Spee INTERMEDIATE SEMI-TRAIERS (WB- & WB-) v v Whee The Mein Is Sufficiently Wie Fo The Vehicle To Puse In The Mein Vehicle ength Plus 6 Min.) The Cle ine Of Sight To The Right ( V ) Is Mesue Fom The Vehicle Puse oction, i.e., Not Fom The Coss Ro Stop Position; Distnces & m Do Not Apply. INSET A Vehicle Type Vehicle ength (Ft.) Pssenge (P) 19 Single Unit (SU) ge School Bus WB-.5 WB- INSET B NOTES FOR 4-ANE DIVIDED ROADWAY 1.See Sheet 2 fo oigin of cle sight line on the mino o. 2.Vlues shown in the tles e the govening (contolling) sight istnces clculte se on AASHTO Cse B - Intesection with Stop Contol on the Mino Ro. 12// :44:58 AM SIGHT DISTANCES () & ( ) AND REATED DISTANCES (,, & ) (FEET) v 4 ANE DIVIDED ROADWAY m V AST 546 5

6 Cosso See INSET A See INSET B EGEND MEDIAN 22 OR ESS MEDIAN m imit Of Mein Sight Ostuction Spee x m Spee v v ( x Fo One-Step Cossing) PAN PICTORIA ( Fo One-Step Cossing) x 6 Fo Resticte Conitions CZ Fo Nonesticte Conitions See Inex No PASSENGER VEHICE (P) v v MEDIAN OR ESS -64 MEDIAN Spee x m Spee v v C:\\pojects\stns\owy\000-s\ gn SINGE-UNIT TRUCK (SU) MEDIAN OR ESS Spee x m Spee MEDIAN x m Spee 64 MEDIAN v v Whee The Mein Is Sufficiently Wie Fo The Vehicle To Puse In The Mein (Vehicle ength Plus 6 Min.) The Cle ine Of Sight To The Right ( v ) Is Mesue Fom The Vehicle Puse oction, i.e., Not Fom The Coss Ro Stop Position; Distnces & m Do Not Apply. INSET A INSET B NOTES FOR 6-ANE DIVIDED ROADWAY 1.See Sheet 2 fo oigin of cle sight line on the mino o. 9h Vlues shown in the tles e the govening (contolling) sight istnces clculte se on AASHTO Cse B - Intesection with Stop Contol on the Mino Ro. INTERMEDIATE SEMI-TRAIERS (WB- & WB-) 12// :44:59 AM SIGHT DISTANCES (), ( ) & ( ) AND REATED DISTANCES (,, & ) (FEET) V X m v 6 ANE DIVIDED AST 546 6