Starting at 7 am, each vehicle at participating gas stations can get $50 in gas pumped by volunteers until $200,000 is exhausted, as residents struggle with high gas prices. About 4,000 vehicles were expected to get their fill.

RELATED: What you can do behind the wheel to save money as gas prices keep rising

“The soaring price of gas has caused a hardship for too many of our citizens. The average price of regular gas has gone well over $4 a gallon for the first time in nearly 14 years and is now up nearly 50 percent from last year. war in Ukraine, a ban on Russian oil, and high taxes are contributing to rising fuel prices,” Wilson said in a statement.

He called on other businesses to join him as gas prices soar.

Gas station owners Khalil Abdullah and Amin Ibrahim said they would lower their gas prices during Wilson’s giveaway, as well.

RELATED: When will gas prices go back down? Illinois drivers flock to Wisconsin, Indiana for cheaper fill-ups

“As gas station owners we decided to lower our gasoline prices during Dr. Wilson’s gas giveaway in an effort to allow more cars to benefit from Dr. Wilson’s generosity,” Abdullah said.

By 7 am at the Amoco located at 7201 N. Clark St. in Rogers Park, the line, which had started at 2 am, went all the way down Touhy Avenue to Sheridan Road.

WATCH: Lines wrap around blocks at gas stations across city

Evanston carpenter Ricky Kimmons said the high gas prices have been hitting him hard. He was second in line in Rogers Park. It costs him $147 to fill up his Suburban.

“I was like, ‘Is this for real?’ And then I seen it on the news, so I started trying to find out the locations, and I was like ‘oh, there’s one right here by the house five minutes away.’ Got right up, came right over here,” he said. “It helps me tremendously, a whole lot, just don’t know how much I appreciate free gas right now.”

Wilson said he would like to try to do this kind of giveaway one or two more times.

WATCH: Willie Wilson talks about Chicago free gas giveaway

The atmosphere turned into a sort of tailgate in some spots, with those waiting walking their dogs and befriending others in line.

“You’re trying to provide for your family, you’re trying to … raise your children in the neighborhood, and this is a good opportunity to help us get from school back home,” Niki Hammer said.

But the free gas caused traffic gridlock around most of the stations, contributing to a tough morning commute for many.

WATCH: Chopper 7 hovers over traffic jam on 99th and Halsted caused by free gas giveaway

Chicago police are trying to direct motorists to ease the congestion.

While some praised Wilson for his generosity, others were unhappy with the traffic.

“Thank you Willie Wilson!” Melvaughn Thompson exclaimed as she jumped up and down. She was the first in line in Rogers Park.

“I am a doctoral student. I am a struggling student. I am unemployed and I really have been struggling,” she said.

But as some received free gas, others were burning it in traffic.

“Me being frustrated? I mean if it’s worth it, if you want gas, you want free gas, then stay in a line, but, if not, then find something else to do,” Reginald Williams said.

Some angry drivers are planning to lodge complaints with the city.

Participating rentals include:

– Amstar, 368 E. Garfield Blvd.
– Citgo, 9155 S. Stony Island Ave.
– Marathon, 1839 E. 95th St.
– Citgo, 1345 N. Pulaski Road
– Gulf, 9901 S. Halsted St.

– Mobil, 2800 S. Kedzie Ave.
– Amoco, 7201 N. Clark St.
– PO Box, 4359 N. Pulaski Road
– Marathon, 340 S. Sacramento Blvd.
– Falcon, 43 N. Homan Ave.