Fredericton is investing in more permanent radar detection signs in an attempt to curb speeding in school zones.  

Four years ago, the speed limit in many school zones was reduced from 50 km/h to 30 km/h. Shortly after that, the city installed radar detectors that display a car's speed near two schools as an experiment.  

Fredericton Const. Andrew Miller said the experiment's success prompted the city to install six more.  

"Instead of just the standard street sign that people become accustomed to over the years of driving, now these ones obviously light up and flash which grabs your attention," he said.

Miller said drivers see they are breaking the law, and slow down.

"They're phenomenal. They work great and we have noticed a big difference in the school zone for people slowing down," he said.  

Miller said the signs don't stop everyone from going over the limit.   

If motorists are caught, the fines can range from $300 to more than $1,000, double the usual fine for speeding.

Over the next few years, the city plans to have permanent radar speed signs installed at all schools.  

It's expensive, about $16,000 to $20,000 per location, but the city says it's worth it.