"The Transport Agency is hopeful that this process will be started in coming weeks and completed before summer with signs changed accordingly, once the speed change has been formally gazetted."
But Waihola Looking Forward group chairman Stu Michelle said the organisation had written to the NZTA two or three times about the issue.
The last Waihola Looking Forward meeting recently received a response, but Michelle said it did not make much sense. On communication with the NZTA, he said "we just laugh now".
He got "all excited" when he saw the signs were being changed, but "lo and behold, if they didn't put up a brand new 70km/h sign".
Michelle said the highway continued to get busier, meaning Waihola continued to become less safe.
NZTA system manager Graeme Hall said the organisation's safety team had been working on the larger Mosgiel to Balclutha highway safety project in the last year.
"This work is advancing now and the Waihola speed review, proposed separately to the highway safety projects, is also now progressing."
The NZTA regretted the expected timing for the Waihola speed review had not been met.