Police detected two separate drivers on the same day travelling at least 50km/h over the speed limit, not long after two men died in unrelated car crashes near the city.

On March 12, police caught a 30-year-old man who was travelling on Tasman Road, Gumly Gumly at about 140 km/h in an 80 km/h zone.

That same day, a 17-year-old boy was detected travelling at 150 km/h in a 100 km/h zone on Coolamon Road near Downside.

The boy, who was driving in a car with his father, was caught speeding near the site of one of February's horror crashes.

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Riverina Highway Patrol Leading Senior Constable Jamie Mooney said police were disappointed in the "blase attitude" of the young driver when he was caught.

He was was fined $2500 and had his licence suspended for six months.

Officers will support Wagga City Council in operating a 5 week safety campaign, launching this week, that will target 10 suburban and rural roads with enhanced signage and a greater police presence.

It comes after police caught a Wagga man driving through Turvey Park at 135km/h in late February.

"It's very dangerous. Your reaction times are affected. If a child was to step out in front of you there's no way you could stop at those speeds. But we're also getting a large number of just over the speed limit," Senior Constable Mooney said.

"These kind of things make us shake our heads. They happen time and time again. People don't seem to be getting the message."

Council's $4000 safety campaign, which is partly funded by Transport for NSW, includes speed activated radar display signs and bollards with the message "Slow Down" on the identified streets.

"Any visual reminder just to get people to slow down, they might take a look at the sign, take a look at their speed limit, realise they're creeping over and correct their behaviour," Senior Constable Mooney said.

"Whether the signs are there or not, we continue to patrol local roads in relation to speed enforcement."

Council technical and strategy manager Peter Ross said the targeted roads were chosen in consultation with police and residents, who nominated some streets they felt were dangerous.

The streets that will be targeted are: