instruction: per this reference text about Delaware Route 16, how many times does the road change between being a divided highway and undivided?
context: In Saint Johnstown, the road becomes a divided highway and DE 36 splits from DE 16 by heading to the northeast on Shawnee Road. DE 16 soon becomes undivided again and continues east through agricultural areas and woods with some residences, crossing Toms Dam Branch and running through the community of Owens. Farther east, the road passes through the community of Oakley and crosses West Branch Gum Branch and then Gum Branch. The route comes to an intersection with US 113 near a few businesses, where it is briefly a divided highway. Past this intersection, the name changes to Milton Ellendale Highway and the two-lane undivided road enters the town of Ellendale, where it becomes Main Street. In Ellendale, DE 16 runs past several homes, crossing the Delmarva Central Railroad's Indian River Subdivision line at-grade. The road leaves the town and becomes Milton Ellendale Highway again, turning southeast. The route heads through woodland and farms, running immediately to the north of the Delmarva Central Railroad's Milton Industrial Track line. DE 16 turns east away from the railroad tracks and comes to an intersection with DE 30. At this point, DE 5 Alternate (DE 5 Alt.), which runs south along DE 30, heads east along with DE 16. The road reaches the town of Milton, where it passes homes and businesses. DE 16 comes to an intersection with DE 5, where DE 5 Alt. ends and the road name changes to Broadkill Road. The route leaves Milton and continues into farmland with a few residences, turning to the northeast. The road intersects DE 1 and passes north of a golf course before it runs through a mix of farms and woods with some homes. DE 16 turns east and northeast through marshland within the Prime Hook National Wildlife Refuge before crossing Broadkill Sound and reaching the community of Broadkill Beach. Here, the route intersects Bay Shore Drive before ending at a dead end on the Delaware Bay.
response: DE Route 16 changes 3 times between divided and undivided highways per the information provided.