LONDON — One doesn’t need to know sign language to understand what Michael Connolly feels about his colleagues’ efforts to break down the barriers posed by his deafness.

When asked what he thought of his teammates’ decision to learn British Sign Language, the 45-year-old autoworker at the Nissan plant in Sunderland, England, grinned and flashed a universal symbol: Two thumbs up.

Connolly loves having the chance to banter with his co-workers, to talk about everyday things — the kids, vacation plans, a TV program. And now he can, because the entire 25-member bumper-paint team at Sunderland started learning BSL at the beginning of the year.

Connolly is one of four hearing-impaired people assigned to the team. “I’m glad they have all learned sign language for us because I can talk and I lip-read the hearing person, but I have my limits,” he signed in an interview. “If you reverse the situation and the hearing person can sign and speak, they have no limits.’’

The initiative grew out of a broader effort to improve efficiency at the Sunderland plant, which makes sport utility vehicles. While Nissan took steps to overhaul training and increase the use of visual aids during briefings, the bumper-paint team decided to go a step further and learn sign language, said supervisor John Johnson.

Johnson said the thought of mastering the combination of gestures, facial expressions and body language that comprise BSL was daunting. But it helped him understand what life was like for Connolly and the other deaf workers as they tried to learn their jobs and fit into a team without having the ability to share the personal tidbits that build friendships.

“So as a team, we thought how can we knock that barrier down? And obviously sign language was the solution, or at least the start of an opportunity,’’ Johnson said.

The team’s decision is very unusual, said Teri Devine, associate director for inclusion and employment at the Royal National Institute for Deaf People. While many employers make an effort to reach out and engage with deaf workers, few go as far as learning sign language, she said.

Research shows that many deaf people, particularly BSL users, feel isolated at work, Devine said.

Having more hearing people who understand sign language is important because even the most proficient lip readers will only pick up 30% to 40% of a conversation, she added.

Mountains of research show that kindness in the workplace improves productivity as well as being good for the people with their noses to the grindstone, said Cary Cooper, a professor of organizational psychology and health at the Alliance Manchester Business School, University of Manchester.

You can see that at work on the bumper-paint team, where workers had limited ability to communicate before they learned sign language, Cooper said.

“You can find out: What did you do this weekend? What about the football results,” he said. “In other words, you’re cementing the relationship — the team building.”