The council campaign starts on Monday as holidaymakers arrive back in the city in droves at the end of Auckland Anniversary Weekend.
The campaign focuses on non-signalled intersections.
Safety videos will be played in cinemas, on Facebook and Trueview.
Billboards are also being erected at high-risk intersections on local roads and motorway off-ramps in Auckland's rural north and south.
Most of the non-signalised intersection crashes happened on Fridays, so a radio advertisment is being aired on Fridays.
New Zealand Transport Authority crash data shows there were 609 death and serious injury (DSI) crashes at non-signalised intersections across the Auckland region between 2011 and 2015.
They killed 45 people and seriously injured 627.
There was a 43 per cent increase in the number of such crashes between 2013 and 2015. The main factors were poor observation and failure to give way or stop.
Auckland's urban south area had the largest increase in the number of the crashes: up from 27 in 2011 to 43 in 2015, a 60 per cent increase.
In Auckland's rural north and south, there were 102 DSI crashes between 2011 and 2015, which killed 17 people, and seriously injured 85.
AT's walking, cycling and safety manager Kathryn King said that though some of the intersections in rural parts of Auckland could be quiet, it was always essential to give way or stop and make sure it's safe.
"Safety is the highest concern for Auckland Transport and non-signalised intersections are an area of the road network which have had a significant increase in the number of crashes since 2013.
"This campaign is to remind people that they need to be aware of other road users, especially during the summer months when there are more children and holiday traffic on the roads."
AT is also working with the police to reduce serious injury and death at intersections through enforcement and education.
Waitemata District road policing manager Inspector Trevor Beggs said: "Intersections are among the most dangerous places on the New Zealand road network, and some motorists are making poor choices.
"Road users need to take greater care at intersections by being patient and checking more than once that it is safe. If you don't, you're risking serious injury or totally avoidable deaths."
High-risk intersections
North
South
High-risk motorway off-ramps
North
• Silverdale - Silverdale motorway off-ramp SB (Hibiscus Coast Highway)
• Warkworth - Matakana/Sandspit intersection
• Wellsford - Matheson Rd intersection
South
• Manurewa motorway off-ramp (Hill Rd)
• Papakura motorway off-ramps (Hingaia Rd and Beach Rd)
• Drury motorway off-ramp (Great South Rd)
• Bombay motorway off-ramp (Mill Rd)
Your worst intersections
• "The South-Western Motorway (SH20) onramp to go south to Hamilton is horrendous. The stop-go lane lights seem to have to longer phase which cause two lanes of traffic to build up on the South-Western Motorway for several kilometres. Traffic entering the motorway system from Lambie Drive often have to risk attempting a merge as slow traffic across the inside lane of the 3 lane motorway into the middle lane with vehicles bearing down on them at 100 kph. At times cars are stationary while attempting to merge. Also sometimes the que can stretch back past the Lambie Drive on ramp." - Gary Talbot
• "Manukau SH1 south is 7 lanes into 2!!! And they expect people to be patient???????
"Some layouts are totally impractical for on and off ramps and impact of flow heavily." - Jason Hitchen
• "On Symonds St, just past the motorway off-ramp as one drives up towards the Khyber Pass/Newton Rd intersection, there is a bus lane, plus two lanes outside that for other traffic. Traffic on the inside of their lane mostly want to get to Khyber Pass, while buses, in their lane, want to go further up Symonds St to New North and Mt Eden Rds. There is a traffic light for pedestrians, which causes all traffic to stop.
"Buses get a B light - sometimes. What most often happens is a half-second B light, followed by a general green.
"Vehicles then have to complete a criss-cross manoeuvre, making it extremely dangerous because also involved, especially in rush hour, are cyclists using the bus lane.
"This situation has a motorway facsimile not far from there. Same designer? Traffic enters the motorway from Gillies Ave, and just a few metres further on, is the exit to Khyber Pass. Once again, a dangerous criss-cross!" - Jacqueline Dunn