Boston University’s response to safety concerns at the BU Bridge intersection has been “disappointing,” according to a nonprofit urban-planning group, though the school says it is the responsibility of the city and the state to address construction hazards in the area.

The LivableStreets Alliance, formed in 2005 to include the Adaptive Environments project, a group aimed at improving transportation conditions, says the heavily congested intersection of the bridge and Commonwealth Avenue is a dangerous crossing zone made worse by heavy construction.

“Students’ lives are at risk,” LivableStreets co-founder Jeff Rosenblum said in an email. “BU officials have not been responsive. They say they like the City of Boston’s plan for the redesign and feel that it will be safe.”

BU spokesman Colin Riley said the school has provided its input about the Commonwealth Avenue Beautification Project and its interference at the BU Bridge to city officials, but the construction is “ultimately a state project,” with a long history.

“We’re pleased to see the project moving along and confident it will address these concerns,” he said.

Chris Hart, project coordinator of Adaptive Environments, said BU values appearance over utility, adding it is “highly unlikely that BU would know enough to challenge some of the design parameters,” because the university does not have urban planning or architecture programs.

“This is the heart of BU, and yet they seem aloof, disinterested at best,” Hart said in an email.

Riley said the project is “comprehensive, forward-looking and addressing the needs” of various means of transportation.

LivableStreets contacted the Massachusetts Highway Department, the Boston Transportation Department and BU in a February 2006 letter that expressed disappointment in not being involved in CAP’s design.

The letter requested a meeting among advocacy groups, government departments and BU. It detailed issues with the project, including the narrow width of sidewalks, the design of ramps, crosswalks and islands and a lack of bicycle lanes. The initial meeting between the groups, which Hart called “very supportive,” occurred in late April 2006. However, construction began without addressing all of the organization’s concerns, he said.

Boston Transportation Department Deputy Commissioner Jim Gillooly said many of LivableStreets’s concerns have been addressed and design changes have been made, including the planned creation of a bicycle lane that will hopefully run from Kenmore Square to the BU Bridge.

“They have some excellent ideas that we’ve been able to incorporate,” he said.