Bike-friendly Beacon Hill lawmakers want to put the brakes on drivers who share streets with pedal pushers and ban stopping in bike lanes — designating ?cyclists as “vulnerable road users” — but motorized citizens say the proposed rules could make life even harder for senior citizens, truck operators and ?average drivers.

“The bigger threat is to someone who’s not surrounded by a ton of steel. That’s why cyclists are vulnerable,” said state Rep. David Rogers (D-Cambridge), whose two bills already have nearly 30 legislative co-sponsors. One would punish drivers parked in bike lanes with an up-to-$100 fine; the second would label cyclists as “vulnerable users” and define buffer zones of 3 or more feet that drivers must allow when passing.

A third bill filed by state Rep. Denise Provost (D-Somerville) would mandate a 25 mph speed limit for drivers on certain roads that are 40 feet wide and feature bike lanes and street parking.

Some cities, including Boston and Cambridge, already have the $100 fines on the books.

“Whoever’s doing the enforcement, they should look at the situation. If you have someone taking out their shopping because they went shopping and their car’s in front of their house because there’s no parking — in Charlestown people can’t park in front of their houses,” said Boston City Councilor Sal LaMattina.

He added that some drivers picking up their elderly friends and relatives would also suffer.

“For every person we can encourage to ride a bike, we can create one more parking space,” said Richard Fries of MassBike.

But driver Richard Webb of Cambridge said cyclists practically have roadway amnesty already.

“They have too many rights, first and foremost,” Webb said. “And if they do anything wrong, what are they going to get fined for? They already think they run the road.”

Sarah Kimball of Boston, who was hit by a truck a year ago, said protecting cyclists is important.

“It’s dangerous for the bicyclists when someone stops in the bike lane and you have to swerve into traffic around them,” Kimball said. “Safety should come before convenience.”

John Lin’s Savory Food truck was parked in the bike lane on Massachusetts Avenue in Cambridge yesterday because snow blocked the parking spot, but he said he supports the bill.

“I hope people understand — it’s not like we intend to block,” Lin said. “All the cars are parked farther from the sidewalk due to the snow.”