16dn. In transport project, including most of big network. 8 letters.
_ E _ I _ _ _ T. I think the 6th letter is A.
21dn Articulated lorry, van or bike is initially, but not taxi. 6 letters. _ O _ _ _ . I think 4th is C, and VOICED fits, which means articulated, but I can't work out the word play.
27ac Turned, using saw to set about cedar, finally (7).
T _ E _ D _ _.
I don't usually have this much trouble! Grateful for any help.