Traffic on the H-1 Freeway heading eastbound was at a crawl for most of Friday morning because the Zipper Lane did not open.
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State transportation officials say the Zip Mobile's brakes locked up around 2:30 a.m. as it was just starting out.
Crews couldn't get it fixed in time and the Zipper Lane could not open.
That put an estimated 4,000 vehicles that use the Zipper Lane daily back in the normal traffic.
"It shows how important the Zipper Lane is. Obviously, everyone saw the traffic this morning and the need for that is really great," said Dept. of Transportation spokeswoman Caroline Sluyter.
Mechanics were able to fix the Zip Mobile and the Zipper Lane will be open on Tuesday.
The second Zip Mobile should be up and running by the end of the month. Normally, the Zip Mobiles are switched off to avoid wear and tear.
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