In this subchapter and in Subchapters B and C:
(1) "Highway" includes all or any part of a street, alley, or public place or square that is dedicated to public use.
(2) "Improvement" means the:
(A) filling, grading, raising, or paving of a highway in a permanent manner;
(B) widening, narrowing, or straightening of a highway;
(C) constructing of a gutter, curb, or sidewalk; or
(D) constructing of necessary appurtenances to a highway, including sewers and drains.
(3) "Railway" includes a street railway.