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Table 2 -2 <br />Residential Trip Generation Rates <br />Vehicle Trips <br />per Dwelling Unit Number of <br />Weekday Peak Hour Studies <br />Single - family <br />Detached 10.1 1.0 320 <br />Apartments <br />All 6.1 0.7 120 <br />Low -rise 6.6 0.7 22 <br />High -rise 4.2 0.4 9 <br />Townhouses & <br />Single- family <br />Condominiums 5.9 0.6 53 <br />SOURCE: Institute of Transportation Engineers, I98Z iNote: These are not recommended design stan- <br />dards but a compilation of observations.) <br />Factors That Influence Street Use <br />Factors other than ADT that should be considered in decision <br />making may include the following: <br />• Lot width and residential density; <br />• Availability of off - street parking; <br />• The degree to which public transportation is expected to be <br />used; <br />• Vehicle ownership and use characteristics of present or pro- <br />jected neighborhood occupants; <br />• Family size and age characteristics expected within the <br />neighborhood as reflected in the location, kind, size, and <br />price or rent of dwellings; <br />• Proximity to shopping and other support or service facilities; <br />and <br />• Consideration of the community's existing public services <br />such as trash collection, snow removal, and public safety. <br />Recognizing that some of the above factors are not easily quanti- <br />fiable, observing patterns in existing residential neighborhoods <br />that include a collector, subcollector, and access street system is <br />useful in determining local traffic characteristics. <br />Page 9 <br />Design Considerations 29 <br />