Construction has begun on the long-awaited Spring Green Boulevard roundabout project in the Katy area, Fort Bend County Engineering confirmed Tuesday. The $5.1 million project will include a four-legged roundabout to connect two existing segments of Spring Green Boulevard, Katy Flewellen Road and Cinco Trace Drive. Crossover Road will be realigned to intersect Spring Green Boulevard north of the roundabout. Work began Monday after a nearby gas pipeline was relocated. The project was delayed while the county acquired rights of way. Fort Bend County and Newland Homes are funding the project, which is scheduled to finish in May.