Hi there
I did not encounter this problem before today, but after starting a new city, the roads are bending even without the curve button being on.
Any idea what has changed ?
Thank you 
Roads also auto-curve when raised, your roads may have been raised a tiny bit (you can do this by shift-R for example). I just uploaded a small update so they only start auto-curving when it’s at least 5 small steps in the air.
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Thank you Daniel for the swift reply, can’t wait to try out the update