Parked on a busy corner is what looks like a food truck.

Instead of selling poutine or perogies, the people inside are trying to sell the idea of the complete expungement of criminal records for people convicted of cannabis possession.

The federal government recently announced its plan earlier this month to waive the fee and 10-year waiting period required for a pardon for Canadians who were convicted of pot possession before the drug was legalized last fall.

The fast, free pardons are expected by summer, if the bill passes. An estimated 400,000 Canada have criminal records for simple possession.

But for some, pardons aren't not enough.

B.C.-based cannabis company DOJA recently partnered with Cannabis Amnesty to create what they call "the pardon truck." They're travelling around much of Canada, this week arriving in Calgary.

They're asking Canadians to sign a petition for complete expungement instead of a pardon.

A pardon forgives a past offence, while an expungement removes the record entirely.

Staff at the pardon truck were collecting signatures from Calgarians to support the complete expungement of criminal records for people convicted of marijuana possession. (Elissa Carpenter/CBC)

David Duarte, experiential event manager with DOJA, said during his time working on the campaign, he's already met people who have been personally affected by minor cannabis convictions.

"Obviously, they're making good strides," he said of the federal government. "And we're definitely aligned with what they're trying to do, but we try to push it one step further."

A national campaign created by DOJA and Cannabis Amnesty was in Calgary. (Elissa Carpenter/CBC)

He said even with a pardon, people face "tons of hardships," like when applying for a job or volunteering.

"It can be embarrassing to tell family and friends that you have this on the record, so we're really trying to help all those people move forward with their life and get that behind them," Duarte said.

Fraser Tripp said he signed the petition because he doesn't understand how people can be punished for possessing what is now a legal substance. (Elissa Carpenter/CBC)

Others have told him they thought when cannabis became legalized, pardons or expungement would happened automatically. He is trying to tell people that isn't the case.

Calgarian Fraser Tripp stopped to add his signature.

"If it is now legal, why are we punishing people still?" he said.

The group will bring the petition to Edmonton next weekend, and arrive in Ontario by April 20. The petition also can be signed online.