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HomeMy WebLinkAbout2016-06-20 PACKET 06.A. To: Public Services Commission From: Joe Tschida, Engineering Intern Jennifer Levitt, PE, Community Development Director/City Engineer Date: June 15, 2016 Re: CSAH 22 Access Planning Discussion Hinton to Jamaica Background A well-planned transportation system is critical to the growth of a city. Transportation systems require revisions as land use and other factors change. Part of these revisions is the redesign of streets as their current design is exceeded. When redesigning a street, major concerns include the projected average daily traffic, the access a road must provide, and the desired mobility of the road. Based on these criteria, Cottage Grove classifies the roads in one of four ways. A summary of these classifications can be seen in Table 1 below; additional information can be found on pages 6-12 to 6-19 in the attached excerpt of the Future Vision 2030 Comprehensive Plan. Table 1 Classification Intended Use Average Daily Traffic Example Principal Arterial Serve major active areas, longer trips less access 15,000-200,000 US Highway 61 Minor Arterial Connect urban service area with town, medium to short trips, emphasis on mobility 5,0000-30,000 80th Street, Keats Avenue (CSAH 19) Collector Connect to minor arterials serving more short trips. Emphasis on mobility and access 1,000-15,000 Hadley Avenue, 95th Street, Military Road Local Streets Lower speed road with emphasis on access Less than 1,000 Higher classifications include more traffic and many times higher speeds. As a result of these characteristics, there is a need to limit access to ensure the safety of drivers and that traffic flows properly. The City’s guidelines are laid out on page 6-20 in the Future Vision 2030 Com- prehensive Plan, which is attached. Based on the county classification, the preferred spacing would be limited to every quarter mile or more. Discussion CSAH 22 (70th Street) from Hinton Avenue to Jamaica Avenue does not follow the City guide- lines for access spacing with many access points too close together. This creates safety con- cerns as well as traffic flow disruptions. Looking into the future by 2030, the average daily traffic Public Services Commission CSAH 22 Access Planning Discussion Hinton to Jamaica June 15, 2016 Page 2 of 4 will exceed the current road configuration leading to a redesign of the corridor. During this rede- sign, the City and County would also like to address the access concerns along the route. Intersections Along Route:  Ideal Avenue/Homestead Avenue: Serves residential areas, cannot remain full access since it is only 570 feet from Hinton Avenue. Limits the ability for longer turn lanes and the possibil- ity of backing traffic up into the intersection.  Idsen Avenue: Serves residential areas as well as access to Highlands Park and the splash pad.  Innsdale Avenue: Serves left turns for a large residential area to the south.  Inwood Avenue: Connects to Military Road, serves left turns for a large residential area.  Irvin Avenue: Serves left turn for a relatively small residential area.  Isleton Avenue: Serves left turns for a relatively small number of homes.  Private Driveways: There are several along route that must be considered. With many of these intersections being within a quarter mile of each other, the type of access allowed at each needs to be considered along with the possibility of incorporating signals or other advanced traffic control measures into the corridor. Another consideration with the five in- tersections from Idsen to Isleton is the elevation change of the corridor. A few of the elevation and spacing challenges are highlighted in the following pictures: Public Services Commission CSAH 22 Access Planning Discussion Hinton to Jamaica June 15, 2016 Page 3 of 4 Hi n t o n Homestead Private Driveways Isleton Park Inwood Irvin Ho m e s t e a d Innsdale Idsen Public Services Commission CSAH 22 Access Planning Discussion Hinton to Jamaica June 15, 2016 Page 4 of 4 Additional Information: For continued understanding of the City’s policy for road classification and further detail on the projected needs for the transportation system in Cottage Grove, please refer to Chapter 6 of the Future Vision 2030 Comprehensive Plan. Washington County will also be presenting different design alternatives for this corridor.