Waka Kotahi is holding two drop-in sessions held in Sanson and Bulls this week.
The agency's director of regional relationships Emma Speight said the planned roundabout and shared path work together with speed reductions to create a safer network for all motorists.
"Waka Kotahi is committed to Vision Zero, a vision for New Zealand where no one is killed or seriously injured on our roads. We want everyone who uses our roads to get to where they're going safely," Speight said.
"The feedback we get through this four-week engagement period will help inform the roundabout designs. Once detailed designs are completed for the roundabout, Waka Kotahi will seek funding for construction and begin the consent application process."
Speight said the safety improvements are part of the Road To Zero strategy developed in partnership with NZ Police, Ministry of Transport, local government, and WorkSafe that adopts Vision Zero and sets a target to reduce deaths and serious injuries on New Zealand's roads, streets, cycleways and footpaths by 40 per cent over the next 10 years.
"Alongside the plans for a roundabout, which will have a positive impact on safety, we also need to talk about how fast we are driving."
Speight said even when speed wasn't the direct cause of a crash, it was a factor in the severity of every crash.
"It is most often what determines whether a person is killed, seriously injured, or unharmed.
"Lowering speeds doesn't mean we can't make other changes, but it is something we can do now that will have an immediate impact on reducing the risk of deaths and serious injuries on the road."
• There will be a drop-in session at the Sanson Community Hall, 26 Fagan St on Friday, May 7, from 3pm to 6pm and another on Saturday, May 8 at Te Matapihi Bull Community Centre, 4 Criterion St, Bulls from 10am to 1pm.
The public can also give feedback online at SH1/SH3 Bulls to Sanson speed review or email CNISpeedReviews@nzta.govt.nz.