Sound Transit and King County Metro and asking for input from transit riders and Eastside communities about three different options for restructuring transit service along state Route 520.

The changes come in anticipation of major transportation projects that will affect traffic to and around downtown Seattle over the next five years, a release from the Sound Transit said.

Two concepts have been developed to connect cross-lake buses a the University of Washington Link light rail station so riders could transfer from the bus to a train to get downtown.

Routes that could be affected include 252, 255, 257, 268, 277, 311, 540, 541, 542, and 545.

Transit riders and the public can review service concepts through an online survey.

Option A would make it so route 255 would no longer use the downtown Seattle transit tunnel and would instead operate on downtown Seattle streets. This could increase travel times buy up to 20 minutes. Routes 252, 257, 268, 277, 311 and 545 would also see increases of up to 10 minutes, the release said.

Option B would connection those routes with the University of Washington light rail station and add more frequent bus service. The savings generated from moving buses from Interstate 5 would be re-invested into more frequent bus service in the mornings, evenings and weekends.

Option B would also create new, direct connections to South Lake Union and Seattle Children’s Hospital and to south Kirkland, Overlake and downtown Redmond.

Finally, Option C would serve as a hybrid of the two plans and would connect routes 255, 268 and 545 to the light rail station and other routes would continue to provide service to downtown Seattle.

The online survey, and more information, can be found at http://kingcounty.gov/about/news/public-feedback.aspx.