Three billion more dollars -- that's how much a new report says is needed to fix Michigan's roads and bridges.

The National Transportation Research Group, or TRIP -- a national transportation research group -- says at the current funding rate, the percentage of Michigan roads in poor condition will climb from 20 percent last year to 46 percent in 2020.

And the group says the number of bridges in poor condition will climb by 50 percent by 2023.

TRIP that more than $200 million is needed in the Grand Rapids area. Major roads like U.S. 131, M-11 and U.S. 31 are cited for work and right now, there isn't enough funding for many of these projects.

"The concern of course is that the $2 billion needed is actually going to be able to get two, three and four years down from this program, so it's very critical that the legislature stay the course in terms of that funding," said Rocky Moretti of TRIP.

In 2015, state leaders passed a roads bill that would provide more than $4 billion in in funding by 2023. The problem is: half of that money is not guaranteed to be there.

Part of the funding will come from fuel taxes and vehicle registration fees.

"The longer you delay making those improvements, then they become that much more costly," Moretti said.

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