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@ewanmac
If the primary purpose of the session is to work a particular energy system and make a physiological improvement then I always do intervals on the turbo for the consistency. This applies to most of the season.
However as I get closer to races (lol I don’t race anymore 😭) my focus will change from improving my engine to developing race specific skills (eg holding a desired power while in the tt position on real world terrain). To work on these skills I begin to do some interval sessions on the road, but since the focus isn’t solely on the physiological gainz I’m not so worried if I get stuck at a junction or caught in traffic.