A9 Inverness to Perth - with Stop Sign technology!

On our trip back from the NC500 Scotland drive, it's still interesting along the A9 through the Cairngorms. In this video I again mention lots of places along the journey, and add what I call Stop Sign Technology (all the TV adverts stress the importance of technology!) where I freeze interesting and informative signs for a few seconds on screen so you don't miss them - they can often tell you more than I can write in the captions.
All shot in May 2022
Equipment:
GoPro Hero 8 Black
Edit Software:
Videoproc Vlogger
Gimp
Route Generator
Music tracks:
Let Your Body Go Crazy (Instrumental Version) - Zenosyne
Pick Up Your Phone Please - baegel
Querido - Bonsaye
Five Below - Torii Wolf
Future Is Now - FLYIN
JOYFUL VS HAPPINESS - DJ DENZ The Rooster
Lose My Head - Rambutan
Places to Go - Andre Aguado
Let Your Body Go Crazy (Instrumental Version) - Zenosyne

[@ronniel5941]

The very long curve from 19.50 to 20.05 changes radius five times - designed by me in the 1970s. The nearby river and railway made it very difficult to fit a new road in at all just there. Subtle adjustments to the superelevation keep the hands off speed constant in spite of the radius changes.

[@timsharp]

Interesting, yes I see from Google maps that the curve changes slightly as it follows the river. Wonder what you make of this curve - 28.347578299304416, -81.67452646306165. We used to have a house in Florida near here and this bend was notorious going South from the 192 onto the 27. It's so badly designed and in wet weather, the change in curve takes people unawares and is dangerous. Thought you might be interested as you are a curve designer!

[@ronniel5941]

I have not quite found the exact place, but will persist ! I previously designed the interchange at 56 degrees 22 minutes north, 3 degrees 25 minutes west. It also has a tight compound curve, and the steepest motorway gradients in the UK. It was a very awkward place to design and construct what is also the most northerly grade-separated interchange in the UK.

[@timsharp]

@@ronniel5941Try this link instead, it should open up in google maps maps.app.goo.gl/TnvHCbbUL82Dn7dZ9 I don't think I've driven on the Perth curve - it's the one from the A90 joining the M90 Southbound you mean isn't it, not the slip roads?

[@ronniel5941]

@@timsharp Thanks, got it ! The motorway itself through the interchange is mainly 694m radius ( the same as at Balmanno Hill), but tightens to 520m for a few hundred metres opposite the 54m high solid rock cutting. The spur roads which cross each other and the motorway are 129m and 136m respectively, with maximum superelevation (7%) and “slow down” signage. Designed in 1968, very shortly after metric units were introduced.

[@ronniebrown6225]

Good video and I'm glad to see you never claimed " it's a dangerous road", As in my opinion as a professional HGV 1 ( C+E) driver there is no such thing as a dangerous road just stupid drivers who don't know how to adjust to different situations. on a side note the increase from 40 to 50 mph for HGVs reduces the journey time by around 20-25 minutes.

[@timsharp]

Thanks very much for the comment Ronnie, glad you liked it - hopefully the subtitles made it more interesting (these take me many hours to research and add). It's interesting that journey time is reduced by that much - presumably there's less fatigue as well going a bit faster - I'd be nodding off having to go at 40mph! I've just watched the start of the video again and sorry to disappoint you, but one of my early subtitles is about it being 'one of the most dangerous' roads in Scotland, but I agree with you that it's the drivers that make a road dangerous, not the road itself.