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Metropolitan Council Working for the Region. Planning for the Future June 1, 1995 Ms.IGm Skyler City of St. Anthony 3301 Silver Lake Road St.Anthony,MN 55418 Dear Ass.Skyler: In response to our telephone conversation of earlier in.which you were inquiring about trip.generation rates for various housing types as well as typical traffic flow along roadways,I am following up with a letter and some additional information. The rates},ou received from me earlier were taken from the Trip Generation Manual developed by the Institute of Transportation Engineers(ITE),4th Edition(1987). The ITE updates the manual on a continuing basis as additional information is collected and analysed In the case of household trip rates,the trip making characteristics have not changed significantly in the recent past. The number of vehicles owned and the number of residents per household have a strong correlation to trip malting. The more vehicles and the more people.there are,the.more trips will be made per dwelling unit. Consequently,the opposite is also true. Age • plays a role. Trip making per person is less for those of retirement age. Adjustment factors of up to -3.4 are applied to the typical household rates,depending upon household size and vehicle ownership. On the average,single family detached housing generates about 10 trips per day. This rate is for the typical suburban"subdivision'home. In the more established suburbs,such as St.Anthony,the rates would typically be less. Household sizes are usually lower. Residential density is also higher,which usually results in lower trip malting. Trip rates might range from 13.0 trips per dwelling unit to 6.6 trips per unit,depending upon vehicle ownership,family size and housing density. The ITE Manual includes trip rates for a variety of dwelling types. The rates just mentioned are for typical detached housing. For apartment units,the usual generation rates is about 6.1 trips per unit. Low rise apartments come in around 6.6 trips per unit. Residential condominiums are slightly less at 5.9 trips. Retirement communities show rates even lower at 3.3 per unit. However there are only a few surveys available for this type of development. Planned unit developments(PUD)show a trip rate of around 7.4 per dwelling unit. For this type of development the adjustment factors for household size,vehicles available and unit density can also be factored into the trip rates if the information is known. I am including a copy of some of the pages taken from the ITE Manual that show typical rates. Most of these pages I probably already sent to you by FAX If you have any questions or need additional information please give me call at 291-6340. Very truly yours, • Robert J.Paddock Transportation Planner