The MBTA will hold a public preview of its plans to improve the route 23 bus on June 23 at 6:30 p.m at Codman Tech, 450 Washington St., Dorchester. A flyer advertising the improvements says that among the changes planned to come to route 23 are improved reliability, faster service, bus shelters, “enhanced bus stops” and improved traffic flow in the area. Route 23 runs from the Ashmont T station to the Ruggles T station in Roxbury. For more information, contact MBTA project manager Erik Scheier at (617) 222-3214 or at escheier@mbta.com