Directional T

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Directional T

If you're looking at terminating one motorway standard road on another, and you have the money to do something special, the Directional T is where it's at. It uses up more land than a trumpet and involves much more engineering work too. But with plenty of advantages over its smaller cousins, and three flavours to choose from, the Directional T is worth the investment.

Where to Spot Them

Scotland is fond of the design pictured at the top of the page, with them cropping up at the M8/M9 and M73/M74 junctions, and a slightly embellished one for the M90 spur near Perth. In England, we prefer to give one direction priority, as at M27/M275 and both ends of the M18.

Advantages

Disadvantages

Variations

Directional TThe Directional T comes in three flavours. The original - and the one that really is a Directional T - doesn't exist in this country. In the US it's considered the original and traditional form, and one was planned here in Glasgow. There's space and stub sliproads for it between junctions 15 and 16 of the M8, but it was never completed.

Lastly, it's possible to make this a restricted access four-way junction, allowing what would be the terminating road to continue straight through. This can be seen at the M1/M25 interchange.

With thanks to David, Dave Robinson and Peter Edwardson for information on this page.