2001-03-19 Special Called Regular Meeting and Public Hearing

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'- e e (3) 'I 84 Chap. 4 / Functional Circulation Systems TABLE 4.2 Recommended Operational Criteria for Major At-Grade Arterials Sections of Intercity Arterials Within Urbanized Areas Intra urban Arterials , " , I ,I Off-peak periods: Speed (mph) Design speed differential (mph) Progression band cycle length (%) Range of cycle lengths (seconds) Peak periods: Speed (mph) Design speed differential (mph) Progression band cycle length (%) Range of cycle lengths (seconds) 45 min. 10 max. 45 min. 45-90 40-45 min. 15 max. 40 min. 45-90 30-40 min. 10 max. 40 min. 90-120 3-35 min. 10 max. 25 min. 90-120 The minor arterial system interconnects with and augments the major arterial sys- tem. It accommodates trips of somewhat shorter length and slightly lower level-of-service. Therefore, operating speeds and traffic-signal progression may be less than on the major arterial. Such a facility interconnects residential, shopping. employment. and recreational activities at the community level. However. as with major arterials. the minors should not penetrate identifiable residential neighborhoods. .\ Collectors The collector system provides both land access and movement within residential. commer- cial, and industrial areas. Collectors penetrate. but should not have continuity through. residential areas. Operating speeds should be 25 to 30 mph. Since speeds are slower and turning movements are expected. a high speed differential (15 mJh) and closer intersection/access spacings can be used than on arterials. The cross-sectional design of collector streets may involve considerable variation. depending UpOll the type, scale, and density of the adjacent development. Access spacing (public and private). cross section, alignment, and continuity need to be integrated in the design of the adjacent project designs. Therefore. the designer must exercise a much broader latitude of good judgement than with access to an arterial street. For a large development such as a regional shopping center. the on-site roadway that interconnects the parking areas and the access drives is the internal-circulation equivalent of a major collector. Speeds should be somewhat slower than on the public collector street system. preferably 30 mph or less. Locals I: ,,' Local streets serve to provide land access and can and do exist in any land use setting. In other words, there can be local residential streets, local dowritown streets, and local industrial streets. Movement on local streets is incidental and involves traveling to or from a collector facility. Therefore, trip length on the local street is short and as a result volumes may be low and speeds are slow. ~'. ; \" !'j On-Site Circulation I: l;i It: 11,1 ~ The same principles of functional design which apply to streets and highways also apply to on-site circulation systems, and the stages of hierarchical movement are recognizable in an internal circulation system. For example, the aisles leading to individual parking spaces (vehicle tenninal) become the equivalent of the local access streets. Thus, a well-designed internal circulation system will accommodate the order of movement and