The state Department of Transportation will hold a public hearing in Town Hall at 7 p.m. April 23 to discuss plans to add bicycle lanes and pedestrian and traffic safety improvements in Arlington Center. The Safe Travel Project, expected to cost about $600,000, is being done in part to provide a better connection for the Minuteman Bikeway where it passes through downtown at Massachusetts Avenue and Route 60. Cyclists traveling on the bikeway, which extends for 11 miles between Bedford and the MBTA’s Alewife Station in Cambridge, have to cross busy Massachusetts Avenue to get from one leg of the bike path to the next, and must walk their bikes if they use sidewalks to reach the next section. The town is seeking to install a bike lane on both sides of Massachusetts Avenue between Route 60 and Swan Place, where a bike signal would be installed to help cyclists get across the four-lane thoroughfare. Traffic signal improvements and curb extensions for easier pedestrian crossings will also be included in the project.