Drivers headed north on North Main Street can now turn right onto Interstate 393 from the middle lane. Bicyclists heading west on Clinton Street now have their own space, in between through traffic and right-turn lanes.

These are two of a number of changes the city has recently made while doing roadwork around Concord. Turning lanes have changed at three intersections to better handle traffic, and shoulders have been widened on several roads to better accommodate bicyclists.

"Where we can, we're incorporating those features, revising the roadway," said Rob Mack, the city's traffic engineer.

He outlined the changes for drivers:

• South Main/Storrs/Perley streets: Drivers on Storrs Street can make left turns onto South Main Street from either the left or right lanes.

• North Main/I-393/Bouton streets: Drivers on North Main can make right turns onto I-393 from either the middle or right lanes. Drivers in the left lane on North Main can continue straight onto Old North Main Street or bear left onto Bouton Street.

• North Main/Washington streets: Drivers on Washington Street can turn left onto North Main Street from either the left or right lanes.

And for bicyclists:

• New lanes on Clinton Street between South Spring Street and South Fruit Street, giving bicyclists a designated space to the left of right-turn lanes. The reconfigured intersection of Fisherville and Sewalls Falls roads will have a similar layout, which Mack described as "common in many other places of the country. It's a very safe way to handle bike traffic."

• Wider shoulders on sections of Clinton, Pleasant and North Main streets. The city slightly narrowed lanes for drivers, creating more room for cyclists without having to widen the pavement. Similar changes were made on Fort Eddy Road last year, Mack said.

While most of the markings are in place, they'll be finalized in the next few days, Mack said, weather permitting.