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uncongested circulation system." A street networkIsystem must address many issues besides intersection congestion. These include in some degree or another: · Safety: For those on streets, along them, crossing them. Intersection modifications to improve safety (e.g. protected left turn movements) may take away from the theoretical efficiency of an intersection's operation, increasing congestion. · Convenience: For all users who seek to reach destinations in the shortest, most efficient, least "hassle-free" manner. Street access restrictions, turn restrictions, and other measures can improve LOS but make travel less convenient. · Flexibility: Having multiple ways available to reach destinations. These provide options for linked trips and for mobility in the event of accidents, street closures, maintenance, etc. · Emergency response: The ability of police, fire, ambulance services to efficiently and quickly reach all parts of the city. Straight-forward arterial and local collector routes to all portions of the city being served by emergency response vehicles is a key element for the street system, with multiple routes preferable. · Transit opportunities: Routes which reach both significant trip origins and destinations with "on-time" capability. Street-based transit is important, not only for traffic flow improvement, but also for economic/social purposes as well as opportunities for energy conservation, air quality, improvement, and traffic flow improvement, and it should mesh with adjoining cities' networks. Any circulation system will also have to balance city traffic conditions with regional traffic considerations and environmental factors. Regional considerations include how accessible freeways are to local traffic (e.g., ramp metering), how the local street system shifts traffic to neighboring communities' streets (e.g. business park traffic with limited 1-580 access using Dublin Blvd.), and how accessible local streets will be to regional traffic (e.g. limiting cut-through traffic through signal timing, etc.). Environmental factors include total miles traveled and time taken to make projected trips, which directly impact gasoline consumption, air quality, noise generation, and overall quality of life of residents, workers, and visitors. "CUT-THROUGH" TRAFFIC The current General Plan Circulation Element gives only minor attention to the issues of "cut-through" traffic. Regional cut-through traffic is addressed in Program 2.6, recognizing the help which public transit and regional traffic projects can give in mitigating Pleasanton LOS problems. Attention to minimizing neighborhood cut-through traffic is found in Program 3.2 ("... discourage non-local and commercial traffic from using streets through residential areas") and Program 5.2 ("...discourage cut-through traffic by appropriate use of traffic controls."). However, there are no specific policies directed towards regional traffic congestion nor the effects of that congestion on city arterial and collector streets. The Subregional Planning Element of the General Plan contains a transportation section (Goal 3: To achieve a coordinated, efficient, safe, and environmentally sensitive system of transportation and circulation in the Tri-Valley). Policy 12 contains direction to develop a