Effect of Bulb-outs at Intersections on Speed Reduction and Visibility Conditions in Tempo–30 Zone

Subscribers:
9,610
Published on ● Video Link: https://www.youtube.com/watch?v=Jln-WtKYgUM



Duration: 0:00
8 views
0


Effect of Bulb-outs at Intersections on Speed Reduction and Visibility Conditions in Tempo–30 Zone

Tempo–30 zones are used with increasing frequency as a traffic calming measure. They are intended primarily to make the drivers reduce speed to an expected value and increase the safety of traffic. In the Tempo–30 zones the drivers must pay particular attention to vulnerable road users (VRU) who can travel across the street at any place. The drivers are warned of the traffic calmed area ahead of them by the specific street and junction geometry and the street furniture, compelling them to reduce the driving speed. One of the most often used design measures used for junctions located in Tempo–30 zones is narrowing of the junction legs and extending their corners. Reducing the driving speed increases the driver’s central vision area resulting in quicker and easier spotting of pedestrians about to cross the roadway. Bulb-outs (a.k.a. build-outs) provided at junction corners along the intersection legs shorten the pedestrian crossing distance and offer a better view onto the oncoming vehicles. They are usually combined with on-street parking lanes dedicated to local residents. Taking the above facts into account, the author carried out speed measurements on a chosen downtown street located in a Tempo–30 zone. In the survey several speed measuring devices were deployed to automatically measure and record the operating speed and volume of traffic at different test locations at individual intersection legs at the same time. At least one hundred (100) speed measurements were taken per measurement site and direction of traffic. During the survey the weather was dry and such was the pavement surface. The results were subjected to statistical analyses. The statistical inference part of research included, inter alia, nonparametric test of independence and median test performed to confirm the null hypothesis H0 that the measurement results do not depend on the measurement site location. The alternative hypothesis H1 – was confirmed in almost all cases, meaning that the speed distribution parameters actually depend on the measurement site location. The locations of the measurement sites were chosen considering the direction of traffic, bulb-out location and the approach and departure conditions. The measurement data and the statistical test results have confirmed that in Tempo–30 zones bulb-out corners have an actual effect on speed reduction on the approach to the junction, enhancing the driver’s ability to spot any pedestrians about to cross the street. The speed data analyses showed that raising the pavement by 7 cm along the traffic calmed street in Tempo–30 zone had only a minor traffic calming effect. With the bulb-outs in place, the vehicles parked before the junction do not obstruct the pedestrian’s central vision area, thus enhancing their ability to spot any oncoming vehicles.




Other Videos By BP International


2021-10-02Collatz Conjecture Proved
2021-10-01Determining the Effect of Flow Variations to Vibration Tendency in a Hydraulic Manifold
2021-10-01Determination of an Efficient Method to Solve the Guarini Puzzle Generalization Using BipartiteGraph
2021-10-01Study on Nuclear Power Program in Indonesia: Status Updates of Problems and Challenges
2021-10-01Assessment of Contact Pressure on the Road Pavement Created by Modern Vehicles
2021-10-01A Descriptive Study of the Hardness and Microstructure Profiles of SKD61 Steel Plunger Tip
2021-10-01Advanced Study on Antioxidant Properties of Silver Nanoparticles Biosynthesized from Methanolic Leaf
2021-10-01Investigating the Effect of Rotor Angle to Characteristic Amplitudo Vibration Shaft on Wind Turbine
2021-10-01Water Vapor Sensors Based on the Swellingof Relief Gelatin Gratings: Recent Advances and Development
2021-10-01Comparative Analysis of the Effectiveness of Various Traffic Calming Measures Implemented
2021-10-01Effect of Bulb-outs at Intersections on Speed Reduction and Visibility Conditions in Tempo–30 Zone
2021-10-01Effect of the Coincidence of Interdisciplinary Actions on the Expected Speed Reduction
2021-09-30Meissner Effect 1933 Re-explained by Gill’s Electronic Theory of Magnetism 1964
2021-09-30Solar Powered Autonomous Vehicle for Seed Sowing
2021-09-30Study on the Complex Angle in Normed Spaces
2021-09-30Assessment of Prospective Physics Teachers’ Energy Literacy: A Recent Approach
2021-09-30The Effect of Alpha Oscillation Network Decoding on Driver Alertness
2021-09-30Recovery Heat Flux at Superfluid Helium Film Boiling on the Cylindrical Heaters
2021-09-30Recent Development of Intelligent Shunt Fault Classifier for Nigeria 33-kV Power Lines
2021-09-29Pandemic Preparedness and What have We Really Learned from COVID-19 So Far?
2021-09-29Determination of Acousto-Optic Spatial Filters Diffracted Light at Zeroth-Order Using MATLABAnalysis