The 275 bike path is a 44 mile bike trail that runs along I-275 from Northville to Frenchtown Township. It provides a recreational and commuter trail in an area that isn't always bike friendly.
MDOT recently spent $4 million in federal stimulus money to rebuild portions of the trail. 
2010 Open House
MDOT and project team staff will host an open house to provide an overview of the project scope and boundaries of this approximately 7-mile section of the I-275 Metro Trail. This section is planned for reconstruction beginning this spring. There will be an opportunity to provide written feedback and input on various elements of the project including trail signs and bridge aesthetics.
The open house will be held March 30th from 6:00pm to 8:00pm at Plymouth Township Hall at 9955 N. Haggerty Road, Plymouth, MI.
More information available at http://xa.yimg.com/kq/groups/15239344/1346808772/name/mdot%20I-275%20public%20open%20house%20033010%2Epdf
In Canton the bike trail has access points on the east side of I-275 at:
In Plymouth there are access points on Ann Arbor Rd east of I-275 and along Hines Dr, which the trail uses for a bit.
According to the I275bikepath group , MDOT is planning the following construction in 2010:
- Repaving From Hines Dr North to Meadowbrook
- Reconstruction from Hines Dr South to Michigan Ave
- New Trail along M-5 between 13 and 14 mile roads
As of 22 April 2010, the trail is closed between Hines Dr and Michigan Ave.
Later in 2010
- Reconstruction from Michigan Ave South to Sibley Road
- Future Project in conjunction with City of Novi
- Connector from Meadowbrook north to 13 mile and east to M-5
- View the trail on Google Maps
- I275bikepath Yahoo! Group frequently organizes trail cleanup days and advises where conditions are poor
- Michigan Trails & Greenways Alliance's page includes a list of all access points and information about supporting the trail.