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Home My WebLink About2002 04 08 Informational E Results of Initial Speed Study on S.R. 419 COMMISSION AGENDA ITEM E CONSENT INF 0 RMA TIONAL X PUBLIC HEARING REGULAR April 8, 2002 Meeting MGR Km IDEPT /~ Authorization REQUEST: Public Works Department Informing the City Commission of the Results of Initial Speed Study on S.R. 419. PURPOSE: The purpose of this agenda item is to inform the City Commission that the results of the initial speed study of S.R 419 would not support a reduction in the speed limit CONSIDERA TIONS: The City Commission directed staff to investigate the possibility of reducing the speed on S.R 419 during the Edgemon Avenue traffic signal discussions. PEC completed the attached study as part of the temporary design for the Edgemon Avenue traffic signaL The results do not support a reduction in the speed limit at this time, Now that the Edgmon Avenue signal is operational, we will be revisiting speed counts in the hope that a - 'reduction in the speed litriit can' be justified, ATTACHMENTS: 1, PEC Speed Counts COMMISSION ACTION: .. ATTACHMENT NO.1 ~c PROFESSIONAL ENGINEERING CONSUL TANTS, INC. March 18, 2002 WS-005 2-1.0 Me Kipton Lockcuff, P,E. Public Works Director/Utilities Engineer City of Winter Springs 1126 East State Road 434 Winter Springs, FL 32708 RE: State Road 419 - Speed Counts Dear Kip: On November 14 and 15, 2001, we conducted two speed counts along State Road 419 north and south of the Moss Road intersection. For each speed count, the results were broken down into southbound traffic and northbound traffic, The results of these counts are presented in the following table, followed by definitions of key terms. TABLE OF SUMMARIES: 85th Location Percentile Pace Median Average Speed Speed Speed North of Moss Rd-Southbound 54.25 mph 45-54 mph 49,10 mph 49.16 mph North of Moss Rd-Northbound 54.67 mph 47-56 mph 51.54 mph 50.81 mph South of Moss Rd-Southbound 54.66 mph 46-55 mph 49.32 mph 49.44 mph South of Moss Rd-Northbound 54.13 mph 44-53 mph 48.63 mph 48,69 mph ,- DEFINITrONS:' ~--- --- ----- --- -. '- (1) 85th Percentile Speed: 85 percent of the vehicles travel at or below this speed. This speed is the upper limit of "reasonable" speeds for the prevailing conditions, The 85th percentile is commonly used by agencies, including FDOT, to set the speed limit on roadways, (2) Pace: The 10 mph increment or range of speeds within which the highest percentage of vehicles travel. (3) Median Speed: Half of all vehicles travel faster than this speed and half travel slower. (4) Average Speed: The sum of all speeds divided by the number ofvehicles. ~ I "'f;,,,!!:.'{': .: .'/t,'.f!k'(:ii,!,'.J (1u/ (;U/llf!lf/fJ!iV ;JUfUlfH;; :;!Ht":V:"J!:: :)Ol~;': I'::; Jlriilul'';fF1 .t)\!,:;" . >~::~~.: I"~ ,', ':i.}.J . :'):1 ~:.';., ;-".lwla 3280; . .10;' .'22:;'-;.c:' . ::;'X: ,;: B',{)i';"!)i Mr. Kipton Lockcuff, P,E. March 18, 2002 Page 2 The Florida Department of Transportation Speed Zoning for Highways, Roads and Streets in Florida, 1997 edition, Section 9,1, explains that the speed limit should not differ from the 85th percentile speed or upper limit of the 10 mph pace by more than 3 mph, unless supported by supplemental investigations, The supplemental investigations relate to items such as high crash conditions, roadway alignment and curvatures, or other factors, Please note that a higher number of crashes occur when the speed differential is greatest. Individual speeds at the 85th percentile level is by definition the safest speed of traveL Based on this data, FDOT would not support a reduction of speed on this facility, Since the time these speed counts were taken, a new traffic signal has been installed at Edgemon Avenue which may have an impact on the overall travel speeds along State Road 419, Our recommendation at this time is to conduct new speed counts on State Road 419 and based on the results of these counts, a detennination could be made regarding the posted speed limit. If you have any questions, please contact me, Very truly yours, PROFESSIONAL ENGINEERING CONSULTANTS', INe: ' " t::- -r&wj ursan S, MUnjeg, P,E. Associate PrincipaVProject Manager G:\clcrical\HIGHW A Y\I'ECIWS-00510 15g.ltr attachments '" , \ SR419 Speed Study North of Moss Road - Southbound Speed (MPH) Average Percentage Cumulative % 11 to 20 15,5 0,01 0.01 21 to 30 25.5 0,32 0,33 31 to 40 35.5 4.6 4,93 41 to 45 43 17.27 22,2 46 to 50 48 35,84 58,04 51 to 55 53 33.2 91.24 56 to 60 58 7.03 98.27 61 to 65 63 1.46 99,73 66 to 100 68 0.27 100 Speed Frequency Curve Ul 30 r::: 0 ... 25 ra ~ Q) 20 Ul .0 0 iO 15 0 I- 10 '0 ~ 5 0 0 Speed(mph) Cumulative Speed Frequency CUrve ~ Q) > ~ ::J E ::J (J Speed (MPH) .... .._--.. ..-. ----.-~..-----~_____J \. SR419 Speed Study North of Moss Road - Northbound Speed (MPH) Averaqe Percentaqe Cumulative % 11 to 20 15.5 0 0 21 to 30 25,5 0.12 0.12 31 to 40 35,5 1.86 1.98 41 to 45 43 9.31 11,29 46 to 50 48 32.61 43,9 51 to 55 53 44.8 88,7 56 to 60 58 9,52 98.22 61 to 65 63 1.43 99.65 66 to 100 68 0.35 100 Speed Frequency Curve 50 45 40 Ul c: 35 .2 ni 30 ~ GO Ul 25 .0 0 20, iii 0 15 ' t- - 0 10 ~ 0 5 0 -5 Speed(mph) . Cum~ative S~eed Frequency CUrve_ ___ ,_' __ __~,__,_.__~,___ _ ____.__ ,____ _, ____, .--._.f-~ - --~_ --,-. 120 ~ 80 0 CI> ,~ ni :J 40 E :J U Speed (MPH) ~ ..-- _.~--_._- _. _... . --'.. -----------_.___o_________u____. .___..... ___. __. .._--~- ----------.-------------- -'- ~ SR419 Speed Study South of Moss Road - Northbound Speed (MPH) Average Percentaqe Cumulative % 11 to 20 15.5 0.07 0,07 21 to 30 25.5 0.41 0.48 31 to 40 35.5 5.49 5.97 41 to 45 43 19,62 25.59 46 to 50 48 37,2 62,79 51 to 55 53 28,38 91,17 56 to 60 58 7,52 98.69 61 to 65 63 1.08 99.77 66 to 100 68 0.23 100 Speed Frequency Curve Cumulative Sp~ed_ F~e~~~ncy _~,U~~ __ ___ _, '_,.__::.-__--::::-_::-::.' ~_:-:-:-__ . ~ QJ .?: rn E 40 :J U Speed (MPH) -.----.. __0__... _ .. ___._~____...__ '.'_. _____~_..._____ _'_'_0__._ _..____. +_._ ______ to ~ SR419 Speed Study South of Moss Road - Southbound Speed (MPH) Averaqe Percentaqe Cumulative % 11 to 20 15.5 0.08 0.08 21 to 30 25,5 0.42 0.5 31 to 40 35,5 5,66 6,16 41 to 45 43 14.53 20,69 46 to 50 48 35.35 56.04 51 to 55 53 31,65 87,69 56 to 60 58 10.6 98.29 61 to 65 63 1,5 99.79 66 to 100 68 0,22 100,01 Speed Frequency Curve 35 1II 30 c: .2 CQ 25 i: CD 20 1II .c 0 jij 15 0 I- 10 - 0 ~ 5 a 0 -5 Speed(mph) Cumulative Speed Frequency CUrve -_.~--- _.._- - ----- . ...- ---- .------- -._--. ._--. ~.. 120 100 ~ 80 CD ~ ell :i E :J o Speed (MPH) ------_._-~. ._-------~_.- . ..-."-.- .._----------~----...._-_._- -- ---- ----_.__._--~ .....,;;