Average speed cameras on the notorious A9 are not expected to become operational until the autumn and not the summer as originally planned due to technical problems.
The devices will also only be installed on single carriageway sections between Perth and Inverness.
Transport Minister Keith Brown had previously said that he hoped the first of the devices would become fully operational by the summer months when the road is at its busiest.
However, chairman of the A9 Safety Group, Stewart Leggett, said: "We are moving on from the design phase to the introduction of the equipment itself. We expect it to be operational in October."
The new system was announced last year as an interim safety measure until the road is upgraded to a dual carriageway all the way to Inverness by 2025.
It originally said the system would operate on the 136 miles from north of Keir Roundabout at Dunblane to south of Raigmore Interchange in Inverness with most observers believing it would be on single and dual sections.
Transport Scotland has now made it clear that on the 113 miles between Perth and Inverness, there will be seven distinct average speed camera system zones, all of which will be on single carriageway sections.
There are about 80 miles of single carriageway on this stretch of the A9. The cameras are expected to be three to four-and-a-half miles apart.
Between Perth and Dunblane, which is all dual carriageway, there are expected to be 14 camera locations about the same distance apart.
Why are you making commenting on The Herald only available to subscribers?
It should have been a safe space for informed debate, somewhere for readers to discuss issues around the biggest stories of the day, but all too often the below the line comments on most websites have become bogged down by off-topic discussions and abuse.
heraldscotland.com is tackling this problem by allowing only subscribers to comment.
We are doing this to improve the experience for our loyal readers and we believe it will reduce the ability of trolls and troublemakers, who occasionally find their way onto our site, to abuse our journalists and readers. We also hope it will help the comments section fulfil its promise as a part of Scotland's conversation with itself.
We are lucky at The Herald. We are read by an informed, educated readership who can add their knowledge and insights to our stories.
That is invaluable.
We are making the subscriber-only change to support our valued readers, who tell us they don't want the site cluttered up with irrelevant comments, untruths and abuse.
In the past, the journalist’s job was to collect and distribute information to the audience. Technology means that readers can shape a discussion. We look forward to hearing from you on heraldscotland.com
Comments & Moderation
Readers’ comments: You are personally liable for the content of any comments you upload to this website, so please act responsibly. We do not pre-moderate or monitor readers’ comments appearing on our websites, but we do post-moderate in response to complaints we receive or otherwise when a potential problem comes to our attention. You can make a complaint by using the ‘report this post’ link . We may then apply our discretion under the user terms to amend or delete comments.
Post moderation is undertaken full-time 9am-6pm on weekdays, and on a part-time basis outwith those hours.
Read the rules hereComments are closed on this article