Traffic Analysis of intersection

Traffic Analysis of intersectionKimberly ColavitoAmanda CzerweicAlison KoerkenmeierEmily OKeefeCE 452 Prof. Fang

Intersection BackgroundIntersection: Garden Street, Asylum Avenue, and Farmington Avenue: The area within the red circle in the below figure is the intersection the team will be analyzing.

CharacteristicsFour legsAsylum AvenueStop signBus stopPedestrian crossingTraffic lightGarden StreetOne wayFarmington AvenueSpring StreetOne wayPedestrian crossingTraffic light

Field Observations and DataAt time of collectionFaded crosswalks/line markingsLong queuesPoor phasing

Field Observations and Data

SignificanceObjective: To create a safe, more organized intersection that has clearly defined lanes, signals, and pedestrian crosswalks.Importance: Downtown HartfordLocal businesses/apartmentsPublic transportationPoints of interest

Data Criteria & PlanPlanThree daysMondays and Wednesdays4:45-6:15 CollectionCars entering intersectionCar movementSignal phasingQueuesHeavy vehiclesPedestrian crossings

Cycle Lengths of Each DirectionLocationGreenYellowRedEB Farmington Ave/ Asylum 42.022.8460.11WB Asylum41.752.9260.24SB Spring St48.353.4664.09

Data Collection

Average Traffic Counts With MovementsLocationThruRight TurnsLeft TurnsHeavy vehicleQueuePedestriansParked CarsEB Farmington Ave/Asylum 607904226130WB Asylum4476603340005SB Spring St0528594338180

Data Collection

Stop Sign

Additional Data CollectedDescription of Location# of VehiclesNumbers of cars that came from stop sign at EB Asylum Ave269Parked Cars WB Asylum3 to 5Buses, EB Asylum5U-turns onto Farmington Ave form EB Asylum Stop Sign9Right from Spring Left onto Farmington Ave211

Data Collection

Data Analysis-HCS Phasing

East/West bound Signal Phasing

North/South bound Signal PhasingSignal Layout

EB Phasing: G 42 Y 2.8 R 60WB Phasing: G 42 Y 2.9 R 60SB Phasing: G 48 Y 3.5 R 64

HCS AnalysisMovement Group ResultsEBFarmington Ave/Asylum AveWBAsylumNBSpring STSBSpring StApproach MovementLTRLTRLTRLTRAssigned Movement5212161674143818Control Delay (d), s/veh0108.988.277.600070.501120.9Level of Service (LOS)FFEEFApproach Delay, s/veh/LOS108.9F86.8F01015FIntersection Delay, s/veh/LOS414F

Data Analysis-HCS

Data Analysis-Synchro 9LOS

Data Analysis-Synchro 9Delay

Design vehicleCity Transit BusRedesign: Roundabout

Redesign: Roundabout

Entering cars vs. conflicting carsEntering from each legConflicting cars already in roundabout

Number of lanesAmount of Entering CarsAmount of Conflicting CarsAsylum Ave.513666Spring St.587447Asylum Ave.292864Farmington Ave.324379

Redesign: Roundabout

Radius of curvatureCenter island: 31.8 feetOutermost: 61.8 feetOutermost(including shoulders): 65.8 feet

Design Speed15 miles per hour

Pedestrian considerationsCrosswalks/Sidewalks

Redesign

Spring StreetAsylum AvenueAsylum AvenueFarmington Avenue

Redesign Roundabout Synchro

Literature ReviewRoundabouts: An Informative Guide Published in June 2000 by the Federal Highway Administration (FHWA)Six Planning Steps for RoundaboutsIncreased Safety compared to conventional intersections

Roundabouts: An Informative Guide 5.2.1 - Single-lane Roundabout

SafetyPedestriansNew crosswalks and sidewalksVehicles and busesSlower speedsShorter stopping sight distanceDesigned bus stop

FlowMore uniform and efficientAllows for better access to surrounding areaLand and Street RequirementAdditional land needed from Bushnell Park

Conclusion

Questions?