While the majority of downtown streets near the path of Friday's tornado were re-opened late Monday, some key arteries will remain closed as repairs continue.

They include Marietta Street in front of the CNN Center (between Andrew Young International Boulevard and Centennial Olympic Park Drive) and Andrew Young International between Peachtree and Spring streets. Atlanta Police say the street closures are likely to last "a few more days."

Warnings about anticipated downtown congestion Monday led more commuters than usual to opt for MARTA -- but not enough to completely avert a morning jam-up caused by closed streets and still-broken traffic lights. While the data's not yet in, the agency said parking lots south of Five Points were more packed than usual.

"College Park and East Point were full," said MARTA spokeswoman Cara Hodgson. MARTA is not initiating any changes to facilitate any potential bump in passengers, she said, except for detouring its buses around the blocked streets downtown.

Marvin Woodward, an official with the Georgia Regional Transportation Authority, said it also was detouring its commuter buses around the street closures. No word yet on whether GRTA also received a passenger spike Monday.

Some of the Atlanta routes covered by Cobb Community Transit had to take detours on Monday, but will not on Tuesday, according to spokesman Robert Quigley.

Outside of downtown, several streets will also be closed until further notice.

A section of Boulevard -- between Memorial Drive and Gartrell -- could be shut down as long as three weeks, police say, while workers reinforce the main wall of the Cotton Mill Lofts. It's been deemed unstable by the Atlanta Fire-Rescue Unit.

Also within Cabbagetown, Powell Street -- from Kirkwood to Memorial Drive, Berean Avenue -- from Wylie Street to Memorial -- and Gaskill Street -- from Mauldin to Carroll Street -- will all be closed indefinitely.

The same holds for Patterson Avenue -- from Glenwood Avenue to Metropolitian Avenue -- in East Atlanta.

Ariel Hart contriburted to this report