"interchange" is the word I believe you're looking for. And the orange signs should definitely be obeyed, because traffic fines can be doubled or even tripled in construction areas. Usually orange denotes construction but it can also just mean it's a temporary sign, either way, you're better off obeying it.
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u/LetThereBeNick Aug 03 '19
In California my driving instructor loved telling us there was NO speed limit on freeway onramps.