Seven of 10 top projects most important to improving the state's transportation system and boosting its economic prospects are in southeast Michigan, according to the report by TRIP, a Washington, D.C., nonprofit transportation research group funded primarily by the construction industry. TRIP plans to release the report at a news conference this morning at the Detroit Regional Chamber's offices.

TRIP spokesman Frank Moretti said the group, which is conducting similar studies in other states, recognizes Michigan's serious economic problems, including a projected $1.5-billion state budget deficit. But he said the 50 projects statewide identified in the report "are a blueprint for the state's future growth."

Other states have similar challenges, but "Michigan, with its significant economic problems, is facing this earlier than others," Moretti said.

The report ranks the Detroit River International Crossing -- a proposed new bridge to Windsor 2 miles south of the Ambassador Bridge -- as Michigan's most crucial transportation project. Canada has offered to pay the state's $550-million share of the $2.2-billion project, which awaits approval in the Legislature.

The TRIP study ranks widening I-94 between I-96 and Conner in Detroit, widening I-75 and upgrading some of its interchanges through Oakland County and building a rail line from downtown to 8 Mile as crucial to reducing congestion, creating jobs and spurring new development.

Funding the road projects would be challenging in good times. The I-94 proposal is projected to cost $1.4 billion, equivalent to a year's road and bridge budget for the Michigan Department of Transportation. Adding lanes to I-75 between 8 Mile and M-59 would cost more than $600 million.