The commission may:
a. Construct and maintain along, across, upon and over any of the real estate acquired by it under sections 40:37-96 to 40:37-174 of this title, roadways, parkways or boulevards;
b. Grade and improve the same;
c. Regulate the width thereon of sidewalks, roadways, service ways, bridle paths, bicycle paths or roads;
d. Plant therein trees and shrubbery;
e. Construct such sidewalks, roadways, service ways, bridle paths, bicycle paths or roads and pave the same, or any part thereof, in such manner and of such material as it may deem advisable. The grading, construction and improvements may proceed simultaneously, or from time to time, and in and upon such parts or sections of the parkways or boulevards as may be determined by the commission from time to time.