Friends and family of a couple killed on Christmas Eve last year held an emotional memorial at the site of the tragedy in northwest Calgary on Tuesday.

Effective Dec. 1, municipalities and police agencies will not be allowed to install new or upgraded photo radar devices or set up new locations as the provincial government examines the current rules.

Alberta's tow truck drivers want to change the colour of flashing lights on their vehicles, because they say the current amber lights aren't prompting drivers to slow down and it's putting operators' lives at risk.

Fines for speeding in a playground zone can range from $78 to $474, according to Calgary police.