Grand Junction—The popular bus service that connected Glenwood Springs to Denver is getting bigger. The Colorado Department of Transportation is expanding Bustang bus service to southwest Colorado. Starting next summer, the eye-catching purple buses equipped with extra amenities will be connecting Grand Junction to Durango and Gunnison to Denver while serving the cities and towns in between. C-DOT officials say Bustang will also take over the route connecting Grand Junction to Denver because Greyhound is canceling service between the two cities this summer. Bustang ridership has seen a 52 percent increase in service along the I-70 and I-25 corridors.