Loading...
HomeMy WebLinkAboutM-90-0217Jorge L. Fernandez City Attorney Irma M. Abella Assistant City Attorney IMA /dot /P337 cc: Beverly Solomon !NI TFR-Or-FIC.E . ;LC I .-- March 22, 1990 James J. Kay, Assistant Director, Department of Public Works, has informed me that a permanent four -way stop sign has already been installed by Dade County at the intersection of S.W. 22 Avenue and Tigertail Avenue, so, consequently, a resolution requesting this installation will not be necessary. /1 5 Item #45, City Commission Meeting Agenda for March 8, 1990 Honorable Mayor and Members of the City Commission • (9esar H. Odi.o City Manager CITY OF MIAMI. FLORIDA INTER - OFFICE MEMORANDUM DATE SuEJECT FE8 2 71990 Discussion on Effectiveness Strips (Speed cc: cpF�YCEs Report, Location Ma. =':::csuRES p Map, Letter from residents, t the of Rumble Strips) The purpose of this discussion is to review the effectiveness of the recently installed "rumble strips" within Coconut Grove to control vehicular speeds and determine if their installation should be considered for future traffic problem locations, BACKGROUND: At the September 27, 1989 City Commission meeting, the Commission directed the Public Works Department to install "rumble strips" at selected locations on a trial basis. "Rumble strips" were installed at the locations shown on the attached sketches. The purpose of the trial period is to determine if the "rumble strips" are effective in reducing vehicular traffic speeds and raising driver awareness to local conditions affecting the residential roadway. Additionally, the effects of the noise generated by a vehicle passing over the "rumble strips" on the surrounding residences has been evaluated. Two styles of "rumble strips" were installed: A series of raised asphalt ridges and a series of grooves cut into the asphalt pavement. Both styles of "rumble strips" have been thoroughly evaluated during the test period. A copy of the test evaluation report is enclosed, The Metropolitan Dade County Public Works Department has indicated to the City that "rumble strips" are considered a traffic control device under jurisdiction of the County. However, as of this date the County has not objected to their installation on City maintained streets. 94-0217 45 TEST EVALUATION REPORT OF RUMBLE STRIPS Prepared by the Department of Public Works, City of Miami, Florida Rumble strips can be described as patterned sections of rough pavement which are usually installed to alert drivers to the pretence of a dangerous condition or a specific control device. While used primarily on major streets, the Public Works Department has installed "rumble strips" on several residential streets to determine if they can be used as an effective speed control device. Two styles of "rumble strips" have been installed and evaluated: a series of raised asphalt ridges and a series of grooves cut into the asphalt pavement. The difference between these two devices is readily seen on the attached detailed drawings. TEST RESULTS Field observations and readings were collected on February 14 and 16, 1990 during a one hour midday time period. Vehicles were physically observed for speed reduction, partial avoidance of strips (two wheels leaving normal driving lane) and complete avoidance of strips (entire vehicle leaving normal driving lane). The noise generated by a vehicle crossing over the strips as compared with normal neighborhood noise without the strips was also measured. Noise levels are expressed in decibels, the usual unit for measuring the relative loudness of sounds, ordinary speech registering approximately 60 decibels. A visual observance of speed reduction was used to match the neighborhood residents perception of vehicular speeds. Tigertail Avenue /S.W. 22 Avenue (raised strips, four directions) Total vehicles 353 Vehicles observed reducing speed 17 ( 5%) Partial avoidance of strips 100 (28%) Total avoidance of strips 12 ( 39) Noise level without strips TBA Noise level with strips TBA Tigertail Avenue /Blaine Avenue (grooved strips, one direction) Total vehicles Vehicles observed reducing speed Partial avoidance of strips Total avoidance of strips Noise level without strips Noise level with strips 1 109 10 ( 9 %) 0 ( 0 %) 0 ( 0 %) TBA TBA E s 0.021 The high rate of vehicular avoidance of the raised style of "rumble strips" indicates that divers were well aware of their presence before they were encountered. It is assumed other drivers recognized the strips but chose to proceed at the same speed, legal or otherwise. The grooved style of strips are less recognizable and not avoided, possibly accounting for a higher percentage of vehicles reducing speed. Metropolitan Dade County has been requested to install traffic warning signs in advance of the "rumble strips ", however, as of this date the County has not installed the signs. Based on the results of the test period, advance warning of the "rumble strips" may encourage vehicle avoidance of the devices, rendering them ineffective and possible dangerous. Both styles of "rumble strips" encouraged observed speed reductions in less than 10% of the vehicles. As is suggested by their name, rumble strips generate noise when contact is made by vehicular traffic. Frequent passage of vehicles over the strips can be a nuisance and negative reactions by area residents to the noise levels generated by the strips have been realized. The noise levels for the test strips have been measured and are appreciable compared to the normal noise levels without the strips. If additional "rumble strips" are to be installed on City streets, it is suggested that a majority of the property owners on that street concur with the application of the "rumble strips" and that they are fully aware of the noise generated by the device that the tests have shown. - 2 _ _0 -0217 3 PUME3 STelP5 1K1 TI-1g COCOMUT GPOVE. MOGI-000400D z • EXISTING RUMSL srelp LOCATIOM * SEE !PAGE 2 THIS DETAIL MET ROPOL I TAN DADE COUNTY PUBLIC WORKS DEPARTMENT ROADWAY RUMBLE STRIPS (RECESSED) TYPICAL A PROVED DEVISED PLAN VIEW NOTE: ROADWAY RUMBLE STRIPS SHALL BE INSTALLED ADJACENT TO R2 -IS 6 R2 -5C SIGNS WHERE SPECIFIED AND SHALL SE CUT ACROSS ALL LANES IN THE DIRECTION OF TRAVEL FACING THESE SIGNS. CROSS SECTIONAL. VIEW STANDARD ROAD DETAIL ROADWAY RUMBLE STRIPS 90-0 10 SHEET I OF ! I.1 Ilill,1111111,11114 11 II11111_111J, mot notate SOW A1.7 soot, M e.. w. •w•e «f. O 4,a /Iaw.•mu• f lea .Jp — M amp _a.1 1 NMI* •. a. ..w.i w.w.4b wet a list IO..l•.elht Is es 1e.w, Ss iw.rrne. SA IIAUYEO 6u .I1 U, 1 e 1, .1 I : Ll 11 11N del a 1 ii 1.11111,1 FLASH= BEAM INTERSECTIONS - IND sm ana- T ASEP �, {.� - # ,y71 Sam ! F f or 1foerowvre0.m 1 ONE •OM c> se. II 11_1 Au I i 1 11 ,II .1.11111 k — } , - 1 _ tar I sr go 1 STRUCTURES WITH LESS THAN FULL WIDTH SHOULDERS I ir 1. I o • VAT site Stows Asmoto' t .I /Woof e ,• ,.. ..._ {e7 • a ■S • • 4,W • 4,a CEMENT. NOTES 1. Ner* *M e.I R/I "miaow 410 Ms sr. loos. almost roe r Ire*rlo. s • swop .I■ Sm '' VS 2. 44.4,. WW1 M Sr as. .. I4, Ls/.woos J. wee w •••• l .9.1.. 9 414 MOO naM.M 4141,s r woo woos Sr1►o � •" � « raw. 41rn. 411.14 f>Jw. "•.414! 414 4. Mare %.M 411/b 411411 at sow w. woos w mos or *SA Sabo M. 40. Sri. // aff .e4 , am. NI ..41rla.r Na sww. w0 _! A.. 41. A••. MIL, rerf• f.Ie As' ,444.01•0 I 4, fe sato some moo.. too toe. to tof. •f ,115E T 1 , - f Mal STRIP SET N..1 r army - e a •∎••SI RUWBLE STRIPS 1 t Dear Dr. Prieto—Portar, �-v 4 T � i CL!VEfl ► ,iu; 15 P'n 2: 27 • 1 :!71 1 am concerned that the rumble strips that were recently installed on S.W. 22 Ave. and Tigertail will cause a severe accident. People in cars will habitually tend to go around the rumble strips and enter the lanes of oncoming traffic. This phenomenon of bypassing the strips can be witnessed along the roadways at Miami —Dade Community College South. Furthermore, the University of Miami has concluded in a study that these rumble strips cause damage to an automobile's suspension. This damage can be avoided if the driver goes over the strips at a fast speed — a process that contadicts the intended function of the strips. Please remove the rumble strips from S.W. 22 Ave. and Tigertail. 1 was informed that the City Commissioners ordered the installation of these rumble strips. Please inform them of my concerns. Sincerely, Don Deresz 1852 S.W. 24 St. Miami, FL 33145 November 14, 1989 co CV > E Mr. Luis A. Prieto - Portar Director, Public Works 275 N.W. 2 Street Miami, Florida 33128 Dear. Mr. Prieto - Portar: JOHN A. AND REBECCA D. CARLISLE 2445 S.W. 28 STREET COCONUT GROVE, FLORIDA 33133 (305) 854 -1993 November 15, 1989 This letter is in reference to the rumble strips that have been installed in various places on Tigertail Avenue. I think this is a very good idea for traffic control. I travel Tigertail Avenue on my way home from work, and I notice the traffic does go slower over these rumble strips. The traffic on 28th street is excessive and fast. I believe that by putting rumble strips on 28th Street, the traffic will be somewhat slower. Very truly yours, ca,44 Rebecca D. Carlisle Leuis A. Prieto - Portar Director of Public Works 275 NW 2nd Street Miami, FL 33128 Dear Mr. Prieto - Portar, Darby Hayes and Joseph Piscatelli 3201 Kirk Street Coconut. Grove, Florida 33133 We live at 3201 Kirk Street, the northeast corner of Kirk Street and Tigertale Ave in Coconut Grove. The rumble strips that were recently placed at the intersection of Tigertale and SW 22nd Ave. are creating more than a rumbe for us. We specifically are addressing the strips that boarder our driveway entrance on Tigertale Ave., south of 22nd Ave., on the east side. As it is, the traffic noise on Tigertale is bearly tolerable. The continual sounds of speeding cars, blowing horns and screeming fire engine sirens create a constant interference in our air space. Now we have the rumble strips which have increased the noise levels so much that they are di;_upting our sleep hours and much needed quiet daytime hours. We would like to officially go on the record as opposing these rumple strips. They do not slow down traffic and the noise that they cause is startling and offensive. It is effecting our well being and the tranquility of our home environment. We understand that these strips are temporary, therefore we are requesting that they be removed and that the Commission explore alternative traffic and safety control measures that lower noise levels rather than increase them. Thank you for your consideration. ci0 —Qti1`7 LUIS A PRIETO•PORTAR, PH.D., P.E. Director December 14, 1989 Dear Mr. Herndon: ()Tifll of Mr. Walter A. Herndon, Director Dade County Public Works Department 111 N.W. 1 Street Miami, Florida 33128 COCONUT GROVE TRAFFIC STUDY City of Miami Commissioner Miller Dawkins has received a request from several residents of the Coconut Grove neighborhood to control vehicular traffic in their neighborhood. Their suggestions include the installation of a traffic signal at the intersection of Hibiscus Street and Charles Avenue, a traffic study of the intersection of Franklin Avenue and Douglas Road to determine if a traffic signal is warranted and the designation of Charles Avenue "one way" eastbound between Hibiscus Street and Main Highway. The Highway Division of your Department is currently conducting a traffic study of this area of Coconut Grove to determine if a traffic signal is warranted at the intersection of Franklin Avenue and Main Highway. The residents would appreciate your expanding this study area to include their suggestions for controlling traffic in their neighborhood. Please inform me of your Department's decision concerning these recommendations so that I may update Commissioner Dawkins and his constituents. On a related traffic control issue in the Coconut Grove neighborhood, the City Commission, at their September 14, 1989 meeting, directed the Public Works Department to install "rumble strips" at nine locations in Coconut Grove. Enclosed are location maps showing where the "rumble strips" were installed. The Commission has since directed that traffic warring signs indicating "rumble strips ahead - reduce speed" be installed in advance of the "rumble strips ". Since Metropolitan Dade County is the authorized agency for the placement of traffic regulatory signs within the public right of way, please investigate this request and notify this Department of your decision concerning the placement of traffic warning signs. Page 1 of 2 tarn !.11 1939 DEC 26 DEPART *ENT OF PUSLIC WORKS /2J'S N.W. 2nd Swettimier'r, Florida l3:'.,L/ijSi smut% " CFFiCE CESAR H. ODIO City Manager -0217 ID !D Mr. Walter A. Herndon, Director December 14, 1989 Dade County Public Works Department If you have any questions concerning this matter or need additional information, please call Mr. James Kay, Assistant Director, at 579 -6865. Very truly yours, uis A. ri i'f Portar, Ph.D. , P.E. Director L JH : gc cc: Sergio Rodriguez, Assistant City Manager . 1;,,. FO r( -. Enclosures: Location Map Page 2 of 2