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� - - January 10, 2002 35353C�til�Vadnais Center Drive, St. Paul, MN 55110-5196 651.490.2000 651.490.2150 FAX ¢rchitecture � e n g i n e e r i n g � environmental � transportalion RE: Roseville, Minnesota Highway 280 Corridor Study SEH No. A-ROSEV0201 .00 Highway 280 Corridor Study Team We have developed, reviewed and analyzed alternatives for addressing some of the operational and safety problems on Highway 280 in the corridor from Highway 36 South through Roseville and Lauderdale. We ha�e drawn some conceptual alignments and have analyzed each in detail. Background Highway 280 was built in the late 1950s. It featured a combination of at-grade intersections on the northerly expressway section and early design interchanges on the section from Larpenteur Avenue South. Traffic volumes ha�e grown from 25,000 vehicles per day at the Broadway intersection in 1980 to more than 40,000 in the year 2000. At the same location, the peak hour has 4,100 vehicles per hour. At the south end of Highway 280, the volumes are approaching 70,000 vehicles per day. The crash density on the expressway portion of Highway 280 from just north of Larpenteur Avenue to Highway 36 is almost twice the metropolitan crash a�erage. The crash rate at Broadway is almost twice the metropolitan average. Backup occurs through the expressway portion caused primarily by both the traffic signals. The Broadway Street intersection has a very high volume of cross-street traffic. The high volume of northbound left turns necessitated closing of the median at Roselawn and e�tending the northbound left turn lane to Broadway. The Broadway and County Road B intersections are the only traffic signals on Highway 280 and considering the connections to either I-94 or I-35W and Highway 36, are the only traffic signals for many miles on many motorists' trips. Larpenteur Avenue interchange is a very early design (1950) and has e�tremely substandard geometrics. There are no deceleration lanes or acceleration lanes for the loops and very limited and substandard acceleration or deceleration lanes for the ramps. Alternates A number of options ha�e been considered in the past for alleviating some of the operating concerns and problems. One was to simply close the medians at County Road B and at Broadway and remove the traffic signals. This would eliminate the stopping of through traffic on Highway 280. It would be a relatively low cost improvement, even if acceleration and deceleration lanes were provided for the right- turn only intersection at Broadway. In conjunction with this, some of the additional access points from Roselawn, Summer, and other streets would also be eliminated. Unfortunately, this simple option would also divert a significant amount of traffic, such as the e�sting northbound left-turn traffic at Broadway. Much of this traffic would be diverted to Larpenteur Avenue interchange, and then to Hennepin Avenue and Industrial Boulevard. Other traffic could be diverted back through local street systems to Cleveland Avenue. Loca1 traffic would ha�e a significantly longer trip for some directional moves. Examples would be access to PaCal in Roseville. Shat Elliott Hentlrir.kson Inr.. . Your Trustetl Resourr.e _ Fn��al (lnnnrr��nirv Fmnlnvar