Cycle lanes have been widened and bollards installed between traffic lanes to improve safety for cyclists.
In some cases, bollards have reduced the space available for motorists to change lanes on the one-way system.
The New Zealand Transport Agency, which spent $250,000 on the temporary changes, will continue to assess their effectiveness.
In the past week, an email about bollards installed in lower High St beside the Queens Gardens was sent to the Dunedin City Council customer service centre and referred to the NZTA.
But the national agency had received ''little'' feedback from motorists and cyclists overall in respect of the changes, projects team manager Simon Underwood said.
''As with any change in traffic controls, there will be a period of familiarisation for motorists. We will also carry out our own monitoring of traffic flow and movements at bollard sites, and assess if further refinement is needed,'' he said.
Bollards, like those installed near the Leviathan Hotel earlier this year, were intended to provide protection and define cycle lanes at weave areas, where vehicles changed lanes across the cycle lane.
On the SH1 northbound one-way system, they were installed in Andersons Bay Rd past the Oval, and in lower High St.
Bollards will also be placed in Cumberland St outside the Countdown and New World supermarkets by the end of the month.
On the southbound SH1 one-way, they will be installed from the Toitu Otago Settlers Museum to the Jetty St bridge ramps.
Mr Underwood said a key concern raised by cyclists was their exposure to vehicles as motorists drifted into or crossed cycle lanes.
''The new bollards encourage motorists to move into their desired lane at the earliest opportunity, and this will typically be at a preceding intersection. When turning on to a multi-lane road, nominally motorists would be required to turn into the closest lane available to them, and then weave across to reach their desired lane,'' he said.
Other road rules in relation to intersection safety still applied, Mr Underwood said.
Traffic turning right had to give way to opposing traffic, and motorists should not enter intersections unless they could complete their manoeuvre safely.
Dunedin road policing manager Senior Sergeant Phil McDouall said he had not received any complaint about the bollards.
The NZTA was doing a good job of making the state highway through Dunedin safer for cyclists and motorists alike, he said.
