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Published byEustace Cannon Modified over 9 years ago
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1-23 Shaping the Road Network for Road Injury Protection I MPLEMENTING THE R ECOMENDATIONS OF THE W ORLD B ANK /WHO W ORLD R EPORT IN I BERO -A MERICA AND THE C ARIBBEAN
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2-19 T HREE CRITICAL ELEMENTS TO CONSIDER Speeds on our roadways Safer routes for Pedestrians, Cyclists, and Handicapped Crash protective roadsides
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3-23 C AUSE OF A CCIDENTS Human Factors (95%) Vehicle (8%) 2% Roadway (29%) 3% 4% 24% 2% 65%
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A LL ROADS ARE SAFE AT LOW SPEEDS
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5-19 A RBITRARILY LOW SPEED LIMITS DO NOT WORK
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6-19 DIFFERENTIAL SPEED LIMITS DO NOT WORK EITHER
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7-19 W E SHOULD CLASSIFY OUR ROADS, SET SPEED LIMITS BY ROAD FUNCTION, AND ENFORCE VIGOROUSLY Preferably there would be no exceptions for Geometric design problems Narrow bridges Land use
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8-19 W E SHOULD CLASSIFY OUR ROADS AND SET SPEED LIMITS BY FUNCTION (1-2) We should consider Super highways*up to 110 km/h Flow roads, interurban80 to 100 km/h Distributor roads through cities50 to 80 km/h Residential access road40 to 60 km/h * Not included in World Report
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9-19 W E SHOULD CLASSIFY OUR ROADS AND SET SPEED LIMITS BY FUNCTION (2-2) Super highways are access-controlled and pedestrians or cyclists should never be present* Flow roads should have separate bike and pedestrian lanes Distributor roads through cities have wide pedestrian and cycle facilities Residential access roads should have ample sidewalks * Not included in World Report
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10-19 S PEED H UMPS – EFFECTIVE SPEED CONTROL ? A properly designed and constructed speed hump will tend to reduce the speed of cars and trucks Improperly designed and constructed speed bumps damage cars, buses, etc. They limit response time of firefighters. Proper speed bumps become a play toy for motorcycles creating speed variations that are dangerous “Speed Pillows” are being used in Chile with some success
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11-19 R OAD N ETWORKS, SOME REFLECTIONS ON F UTURE R OADWAYS Future roadways Require a modernization of standards Require a modernization of safety knowledge Even if we add 3 to 5% of new roads each year After 10 years we still have 10,000 km of dangerous road infrastructure If we continue to design with old standards we will have almost 17,000 km of dangerous roads which will be used by our great grandchildren
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12-19 H OW LONG DOES IT TAKE TO MODERNIZE OUR STANDARDS ? Most of our countries allow large and very large roadside sign supports adjacent to the pavements Most of our countries use 1960 roadside barrier standards These barriers may look good to the untrained eye But, these barriers are death traps
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13-19 O NE EASY SOLUTION FOR ROADSIDE BARRIERS Simply require that all barriers, barrier terminals, and crash cushions be “Crash Tested” according to international standards That way we can stop making new drawings each time a new product comes on the market
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Containment Level Transverse Kinetic Energy (kj) N2 20º 110 km/h 1,5 t H1 15º 70 km/h 10 t TL5 15º 80 km/h 36 t TL4 15º 80 km/h 8 t TL2 25º 70 km/h 2 t H2 20º 70 km/h 13 t H3 20º 80 km/h 16 t N1 20º 80 km/h 1,5 t H4a 20º 65 km/h 30 t TL6 15º 80 km/h 36 t H4b 20º 65 km/h 38 t N2 EN 1317 TL3 NCHRP 350 TL3 25º 100 km/h 2 t 20º 100 km/h 820 kg 20º 100 km/h 0.9 t 20º 70 km/h 820 kg
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15-19 A N E XAMPLE : C ABLE B ARRIERS Tested to both EN and NCHRP standards 3.5 Km of median with cable barrier on each side, that is 7 km of barrier Over 300 impacts in 5 years No fatalities and no serious injuries No median crossover accidents Various motorcycle impacts, one fatal but not caused by cables Only posts are replaced, original cables are still in use
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16-19 H OW LONG DOES IT TAKE TO MODERNIZE OUR STANDARDS ? Many of our drainage structures are deadly We keep with the same design standards and no one knows why
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17-19 R OAD N ETWORKS, SOME REFLECTIONS ON P RESENT R OADWAYS Existing roadways Pavement enhancements Speeds will increase Must be accompanied by other safety elements Some roads may have to wait
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18-19 MAINTAINING OUR INVESTMENTS Barriers that are not repaired can not be expected to save lives Crash cushion repairs may be as little as 5% of the initial investment Crash cushions that are not repaired can be very dangerous and will be destroyed with a second impact
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19-19 T HINGS THAT WE CAN DO RIGHT NOW Make greater use of International Road Assessment Program (i-RAP) and Road Safety Audits to identify our needs. Dedicate at least 10 to 20 % of our road budgets to: Train ministry and other professionals Upgrade the safety of existing roadways Maintain existing road safety infrastructure To conduct Research To modernize our standards Each highway agency must have an ongoing program for timely striping and signing of roads Promote modern road safety education at our universities Consider road safety throughout the design process and not as an afterthought Ensure that road safety items will always be funded and not deleted from projects because we ran out of money
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