TRAFFIC ENGINEERING.

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1 Mechanical Engineering Department Carlos III University of Madrid. TRANSPORTATION INTRODUCTION Transport: change of geographical position of people or goods Traffic: transport related exclusively to vehicle movement Millions of vehicles Traffic Engineering Year Traffic evolution in Spain 1

2 INTRODUCTION : Engineering branch associated with the planning, monitoring, geometric design and traffic operations of roads and their networks, so that people and goods move: Safe. Fast. Efficient. INTRODUCTION Two concepts can be outlined: Design of road network for future needs. Traffic regulation to solve actual problems or foreseeable shortdated. 2

3 INTRODUCTION The traffic from a scientific-technical point of view demands the definition of a series of concepts, variables and parameters that allow understanding and approach the solutions to solve the problems generated Laboratory Road Continuous traffic: TRAFFIC FLOW No external fixed regulation devices to traffic flow exist, like for example, traffic lights, that oblige vehicles to stop. The possible stoppage is caused by internal reasons of traffic flow ( accident, collision, break down, etc.) Discontinuous traffic: Fixed elements interrupt periodically traffic (traffic lights, stops, ). These elements significantly diminish vehicle speed in certain instant. 3

4 FUNDAMENTAL TRAFFIC PARAMETERS Traffic flow Speed Density TRAFFIC FLOW Rate of vehicles that pass a given cross section of a road per unit time I = n( x) t Number of vehicles that pass a given road cross section (x) Time interval considered x Units: Vehicles / hour (hour flow). Vehicles / day (daily flow). 4

5 TRAFFIC FLOW t<1 hour 1 hour 1 day 1 year t TRAFFIC VOLUME Number of vehicles that pass a given road cross section during a time interval EQUIVALENT HOUR FLOW t< 1 hour n( x) = expressed in hours I t TRAFFIC FLOW Traffic volume and equivalent hour flow: Time interval 5:00 5:15 5:15 5:30 5:30 5:45 5:45 6:00 Volume (v) Traffic Flow (v/h)

6 TRAFFIC FLOW t<1 hora hour 1 hora hour 1 día hour 1 año year t HOUR TRAFFIC FLOW Vehicles/hour PEAK HOUR FLOW Hour traffic flow measured during the peak hour It is used to: calculate the capacity of roads, intersection characteristics, traffic control, coordination between traffic lights, etc. TRAFFIC FLOW t<1 hora hour 1 hora hour 1 día day 1 año year t DAILY TRAFFIC FLOW Number of vehicles that pass by a given point during a complete day PEAK DAILY TRAFFIC FLOW Number of vehicles that pass during the day of the year in which traffic is heavier 6

7 TRAFFIC FLOW t<1 hora hour 1 hora hour 1 día day 1 año year t AVERAGE ANNUAL DAILY TRAFFIC (AADT) Total number of vehicles that passed by a road cross section during a given year divided by 365 It is used to: Classify roads, number of of accidents, improvement of roads, economic studies CYCLES OF TRAFFIC FLOW %AADT Annual cycle (Madrid) Year Generic tendency (Navarra) %AADT January February March April May June July August September October November December Months 7

8 CYCLES OF TRAFFIC FLOW Distribution of daily traffic flow %AADT of the week %AADT (Madrid) Monday Tuesday Wednesday Thursday Days Friday Week cycle (Gernika) Saturday Sunday Hours PEAK HOUR FACTOR (PHF) FHP = Q 4Q 15MAX Volume of traffic during an hour Maximum volume registered during the 15 minutes within the hour In highway: Q FHP = 12Q 5MAX 8

9 PEAK HOUR FACTOR (PHF) Traffic volume (vehicles) FHP = Volume , Time interval Homogeneous traffic PEAK HOUR FACTOR (PHF) Traffic volume (vehicles) Volume Time interval 2200 FHP = 0,42 Non homogeneous traffic

10 TRAFFIC COMPOSITION % over the total AADT Bus Heavy Taxi Light And: Pedestrian, motorbikes, non motor vehicles, agricultural vehicles FUNDAMENTAL TRAFFIC PARAMETERS Traffic flow Speed Density Traffic volume Equivalent hour flow Hour flow Peak hour flow Daily flow Maximum daily flow Annual average daily traffic (AADT) Flow cycles Peak hour factor Traffic composition 10

11 SPEED Local instantaneous speed Running speed Travel speed Mean instanteneous speed Time mean speed Space mean speed 85 percentile speed Project speed Service speed Local instantaneous speed: SPEED OF A VEHICLE Speed of a vehicle when it passes through a certain road cross section Running speed (V c ): travelled distance V c = time spent to cover the distance Travel speed (V r ): travelled distance V r = total time spent to cover the distance 11

12 SPEED OF A GROUP OF VEHICLES Time mean speed: V t, e V = n Local (V t ) o space (V e ) j X Space mean speed (V r ): SPEED OF A GROUP OF VEHICLES distance V r = average of the time spent to cover the distance V r L = = nl t j t j n Running speed: distance average of the time in movement to cover the distance 12

13 SPEED OF A GROUP OF VEHICLES Velocidad Local instantaneous local Tiempo Time Tiempo Time without excepto stops paradas speed instantánea Segundos Seconds Horas Hours Segundos Seconds Horas Hours (km/h) , , , , , , , , , , , , V V j 394,5 Vt = = = 39, 45km n 10 h r V nl 0,5 = = = 19,56 km t 0, h rm j nl 0,5 = = = 36km t 0, h j , , ,5 8 0, , , , , , V rm V t 85 percentil speed: OTHER SPEED CONCEPTS Speed that is only exceeded by the 15 % of the vehicles, considering only motor cars due to their high speed This speed usually exceeds the mean speed in 20 % Project speed: Speed that is used to define geometric road elements: radius of curves, banking of curves Service speed: Speed at which vehicles could travel in a given road in favourable atmospheric conditions, for a given traffic stream and in a safety way 13

14 FUNDAMENTAL TRAFFIC PARAMETERS Traffic flow Speed Density Speed of a vehicle Local or instantaneous Running Travel Speed of a group of vehicles Instantaneous mean (local or spatial) Time mean speed Space mean speed Other speed concepts 85 percentile speed Project speed Service speed DENSITY Number of vehicles in a road lane per unit length at a given instance Road length Usually measured in vehicles/km. Maximum value There is no space between the vehicles. It is function of the mean vehicle length. It is a measure of the manoeuvre. 14

15 SPACING Distance between the front of two consecutive vehicles travelling in the same road lane at a given distance Road length Mean value s m 1 = D SPACING The safety mean spacing that vehicles should have to guarantee that traffic flow is developed in safety conditions s Vehicle length s s V = 6 + t 3,6 perception s = a + b V + c V Mean speed of the vehicles implied Time gone by between the moment the preceding vehicle brakes until the consecutive perceives it 2 Vehicle length Reaction time of drivers Brake distance 15

16 SPACING V t = 2 / 3s ss = 6 + 0,185V ss = 6 + t perception 3,6 t = 1s ss = 6 + 0, 278V s a b V c V 2 s s = + + s = 5,35 + 0,22V + 9,4 10 V s = 8 + 0,2V + 0,003V s Velocidad Speed in (en(km/h) ss ss = 6 + 0,185V 13,4m 17,1m 20,8m 24,5m 28,2m = 6 + 0, 278V 17,12m 22,68m 28,24m 33,80m 39,36m s = 5,35 + 0, 22V + 9,4 10 V s s = 8 + 0,2V + 0,003V s ,65m 21,93m 28,97m 38,75m 45,29m 20,8m 30,8m 43,2m 58m 75,2m GAP Time gone by between two consecutive vehicles that pass by a given road cross section 2 s 1 τ = t t 2 1 s( m) τ = V ( m / s) The mean value of the gap is: τ τ m = = n 1 I measured in s/vehicle 16

17 FUNDAMENTAL TRAFFIC PARAMETERS Traffic flow Traffic volume and equivalent hour flow Hour traffic flow, daily, MDF, Traffic flow cycle Peak hour factor Traffic composition Speed Of a vehicle Of a group of vehicles Others: 85 percentile speed, project speed, service Density Spacing Time interval I = V D FUNDAMENTAL TRAFFIC EQUATION First approach: s τ = Homogeneous traffic, mean speed V, spacing s V s = = I = D V D I D V 1 τ = I 17

19 FUNDAMENTAL TRAFFIC EQUATION Traffic flow for each lane (veh/h) Unstable flow stream for every type of road Two lane road Highway Intensidad Zero traffic nula (congestión) flow Velocidad Zero speed nula Mean speed (km/h) Increase Aumento of de vehículos vehicles Conditioned Velocidad condicionada speed Intensidad Zero traffic nula flow Velocidad Free speed libre CAPACITY OF A LANE Maximum number of vehicles that can pass by a lane per unit time V C = 1000 s s V = speed in km/hour (vehicles/hour) s = safety mean spacing in metres between the front of two consecutive vehicles, for a given speed V ss = 6 + t 3,6 perception s = a + b V + c V s 2 19

20 LEVEL OF SERVICE Traffic flow < Capacity If the traffic flow equals the capacity: Low mean speed. Low spacing between vehicles. Frequent unexpected stoppage. Collision between vehicles Cualitative measure representative of the operation of a road for a given traffic flow, that has into account a group of factors (speed, manoeuvre, safety, comfort and cost) that take place in it. LEVEL OF SERVICE It is defined taking into account: Speed and time travel, taking into account not only the instantaneous speed but the time needed to cover a distance. Traffic interruptions, and the magnitude and frequency of the sudden changes in speed necessary to maintain the traffic flow stream. Liberty of manoeuvre to maintain the desired speed. Safety, including not only the number of accidents but the potential risk. Comfort while driving. Economy. Service flow: maximum flow compatible with a certain level of service 20

21 LEVEL OF SERVICE Level A High level of functional freedom. Level B Stable traffic although conditioned for the fastest vehicles. Level C Stable traffic although considerably conditioned. Level D Unstable traffic. Level E Flow near capacity, frequent stops. Level F Jammed road. The demand exceeds the capacity of the road. CAPACITY AND LEVEL OF SERVICE IN HIGHWAYS Undesirable level of service Relation I/C Nivel Level de of servicio service Velocidad Service de speed servicio (km/h) Velocidad Specific específica road speed de la vía 110km h I/C Velocidad Specific específica road speed de la vía = 100km h Velocidad Specific road específica speede la vía = 80km h A 100 0,3 0,5 nº carriles lanes No es posible alcanzar este nivel It is not possible to reach this level de of servicio service para for any ningún I/C I/C No es posible alcanzar este nivel It is not possible to reach this level de of servicio service para for ningún any I/C I/C B 90 0,5 0,75 nº carriles 0, 25 lanes No It is es not posible possible alcanzar to reach este this nivel level de of servicio service para for ningún any I/C I/C C 80 0,3 0,9 FHP PHF nº carriles lanes 0,45 FHP PHF No It is es not posible possible alcanzar to reach este this nivel level de of servicio service para for ningún any I/C I/C D 65 0,9 FHP PHF 0,8 FHP PHF 0,45 PHF FHP E <

22 CAPACITY AND LEVEL OF SERVICE IN HIGHWAYS Calculation of C and I s In ideal conditions, between 2200 and 2300 vehicles/hour Traffic of only light vehicles Lanes of, at least, 3,60m width and free shoulders of 1,80m Anchura Lane de width cada carril Factor Correction de corrección para Factor de corrección para Correction factor factor Correction factor autopistas for for two two lane lane de 2 highway highway carriles autopistas for 3 or 4 de lane 3 ó highway 4 carriles 3,60 m 1,00 1,00 3,30 m 0,97 0,96 3,00 m 0,91 0,89 2,70 m 0,81 0,78 Correction factors according to lane width and lateral obstacles (Fc, Fo) CAPACITY AND LEVEL OF SERVICE IN HIGHWAYS Calculation of C and I s Horizontal Terreno llano terrain Terreno Ondulating ondulado terrain Terreno Abrupt accidentado terrain Camiones (E Trucks (E c) c ) Buses Autocares (E a ) (E a) 1,6 3 5 Equivalent factors according to traffic composition Flow service Number of lanes Correction factors I 100 IS = CCI n FC FO C 100 P P + E P + E P S C A C C A A Capacity for ideal conditions I/C for the level of service Percentages of trucks and buses Equivalent factors 22

24 CAPACITY FOR DISCONTINUOUS TRAFFIC Environmental conditions Load index: It evaluates the time usage when the traffic light is green. Peak hour factor: Shows the variations in traffic flow. Urban area: Between two intersections with the same layout and regulation it has more capacity the one situated on the bigger city. Urban position: Also, for different positions of the intersection within the same city capacity is different. Generally, it can be distinguished three areas: town centre, the outskirts and intermediate between the other two. CAPACITY FOR DISCONTINUOUS TRAFFIC Traffic features: Right and left turn: These manoeuvres produce a partial obstruction of traffic stream and may influence capacity greatly when used to much. Buses and heavy vehicles: Due to their low speed and difficulty in carrying out manoeuvres, capacity tends to be diminished. Urban bus transport: In addition, urban buses carry out a lot of stops and starts for passengers. Its effect depends on the number of stops, the city zone, the stop time and their location. Traffic control devices: Traffic lights: Distributes and gives out the time traffic light cycle. Vertical and road signs: They organize traffic stream and improve capacity. 24

25 CAPACITY FOR DISCONTINUOUS TRAFFIC Example: Australian method or Ackelik Total capacity of the road C r n = i= 1 C ci Number of lanes Capacity of the i th lane Theorical capacity of a lane Capacity of a lane C c C f f = f t w p c Correction factors CAPACITY FOR DISCONTINUOUS TRAFFIC Example: Australian method or Ackelik Theorical capacity of a lane Zone Zona Tipo Type de of carril lane A (periferia) Outskirts B (intermedia) Intermediate C (centro) Town centre Straight lane 2. Lane with possible turn. Its radius has to be bigger than 15 metres. Pedestrians will not be allowed to cross. 3. Lane with possible turn. Its radius has to be less or equal to 15 metres or pedestrians would be allowed to cross. 25

26 CAPACITY FOR DISCONTINUOUS TRAFFIC Example: Australian method or Ackelik Width lane correction factor Traffic composition correction factor Anchura Lane del Width, carril, w (m) w (m) f w w 3 0,55+0,14w 3 w 3,7 1 w > 3,7 0,83+0,05w Correction factor for road slope (p) f p f c = n i= 1 n 0,5 p = i= 1 e I i I i i Equivalent factor tabled according to the type of the lane turn Traffic flow for every type of vehicle 26

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