Comparison of I-210 and I-710 as Potential ICM Corridors
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1 Comparison of I-210 and I-710 as Potential ICM Corridors Positive Aspects Traffic sensors Very good PeMS coverage of freeway mainline, HOV lanes, and ramps Many intersections within Pasadena already equipped with traffic sensors SMART test deployment site along Orange Grove Blvd in Pasadena System collecting event-based high resolution traffic data from multiple intersections and generating real time arterial performance measures, such as intersection queue length and arterial travel time Freeway traffic control All I-210 ramps metered, including interchanges with I-605 and SR-57 SWARM test corridor Very likely that a good ramp metering communication infrastructure is already in place HOV lane along entire length of I-210 in both directions Caltrans TMC Traffic-responsive system may exist along arterials of interest in Pasadena and Arcadia Local TMC in Pasadena Transit Metro Gold Line along I-210 Direct connection with downtown Los Angeles Current terminus at the Pasadena/Arcadia boundary, but to be extended to Glendora by 2015 and further west subsequently Stations typically within ½ mile of the freeway Metro Silver line along I-10 Terminus in El Monte, just west of I-605 Traffic sensors Presence of multiple PeMS stations along freeway mainline PeMS stations already installed on most on/off ramps Freeway traffic control Ramp meters on almost all interchanges north of I- 405 Fully metered freeway-freeway interchange (I-105) Existing Traffic Management Centers in the cities of Southgate and Compton Efforts under way to implement centralized traffic signal status monitoring within local jurisdictions (expected completion sometime in 2014) Sensys traffic sensors currently being deployed along a section of Long Beach Boulevard (anticipated completion in summer 2013) Transit Corridor parallel to Metro Blue Line and crossed by Metro Green Line Two Metro Rapid bus lines within corridor, one going to downtown Los Angeles and the other to Pasadena Transit signal priority currently active or available on some arterials within the corridor
2 Positive Aspects Direct connection with downtown Los Angeles Several express buses running along I-10 and I-210 Additional transit connections with downtown Los Angeles Several park-and-ride facilities within the corridor Corridor geometry Linear corridor (east-west alignment). Several parallel arterials in close proximity of I-210 I-10 running parallel to I-210, 4 to 5 miles to the south Several possibilities for crossover between I-210 and I-10 I-605 and SR-57 freeways SR-19 (Rosemead) and SR-19 (Azusa) arterials One-way frontage streets on each side of I-210 within Pasadena Highly directional traffic control needs AM peak Westbound PM peak Eastbound Need to manage time-specific/event traffic patterns Higher congestion levels on Friday afternoon due to weekend traffic Traffic associated with events at the Rose Bowl stadium & Santa Anita racetrack Events associated with Caltech, Cal Poly Pomona and other colleges Other Corridor of national/regional significance Significant sections of the I-710 freeway have recently been rehabilitated Average truck traffic disruptions Trucks only represent 3-5% of traffic Typical of many urban freeways Only one interchange has a high proportion (15-20%) of trucks Allows exploring solutions to improve truck operations around freeway merges Potential for implementing a Phase 1 system entirely within the city of Pasadena System covering I-210, local frontage roads, and possibly one or more additional parallel arterials Potential for system extension through Arcadia
3 Positive Aspects Possibility of dividing the corridor into distinct control areas: Pasadena: High signal density/dense street network Arcadia/Duarte/Monrovia: Medium signal density East of I-605: Low-Medium signal density
4 Areas of Concern Congestion levels High level of congestion along I-210 may limit ICM benefits during peak hour (same problem with I- 710) Some intersections along local street networks already operating near capacity, constraining potential traffic management solutions during peak hour Parking availability High occupancy (> 80%) at many park-and-ride facilities Congestion levels Congestion on surrounding freeways makes it difficult to develop effective alternate routes Truck traffic is currently growing faster than the general traffic and is expected to nearly triple by 2035 Potential need to change management strategies over time Some of the bottlenecks are due to causes that may be difficult to address with traffic management strategies (for instance, congestion along I-710 North in the AM peak) Portion of congestion likely attributable to the high frequency of accidents along I-710 Parking availability Limited parking availability at most light-rail stations along the corridor (particularly along the Blue Line) will limit mode transfer opportunities Limited real-time traffic detection along arterials within the central portion of the corridor Not all cities may have the ability to centrally monitor and control traffic signal operations Cities to the north of the corridor may not have the necessary resources to support the deployment and operation of an ICM system Freeway traffic sensing Health of PeMS stations along ramps (based on February 2012 data) Ramp metering Some ramp meters have been turned off to reduce problems caused by trucks entering the freeway at slow speeds Short ramp lengths within the I-710/I-405 interchange not suitable for the implementation of ramp meters Rerouting opportunities Lack of available capacity at many key intersections, particularly close to the freeway, may create significant difficulty in using the arterials as detour routes High density of traffic signals along surrounding arterials (typically, 4 to 5 signals per mile) may impose long travel times and reduce their attractiveness Motorists may not be willing to travel 2 to 4 miles
5 Areas of Concern along congested arterials to reach a light-rail station along the Metro Blue line Political difficulty of rerouting truck traffic through residential areas Uniqueness of corridor The high volume of trucks and high number of accidents involving trucks make I-710 an atypical corridor Potential difficulty of replicating deployment elsewhere Other Notable Elements Potential for dual I-10/I-210 control: Traffic conditions along I-10 will likely need to be considered when developing strategies for I-210 Frequency of accidents Same daily frequency of accidents as I-710 (10 per day along corridor) ½ the accident rate, as I-210 has about twice the VMT as I-710 Remaining Questions Accuracy of earlier intersection capacity analysis 2008/09 data Analysis based on single-day traffic flow counts Changes in signal timing/controller since analysis? Intersection geometrical changes since analysis? Accuracy of earlier intersection capacity analysis 2008/09 data Analysis based on single-day traffic flow counts Changes in signal timing/controller since analysis? Intersection geometrical changes since analysis?
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