Leeds MP Rachel Reeves has added her voice to mounting criticism of the city's bus system.
Ms Reeves claims the level of service being provided by transport giant First in her Leeds West constituency is "unacceptable".
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Her main complaint is the frequency of buses running between Bramley and Rodley, where hundreds of people have signed a petition calling for an overhaul of local timetables.
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Ms Reeves has now forwarded the petition to First along with a letter setting out her support for its aims.
The Labour MP's intervention follows the launch of two campaign groups that are attempting to win a better deal for bus users in Leeds.
In the letter to First, Ms Reeves writes: "I enclose a copy of a petition, signed by hundreds of local residents, who are not happy with
the frequency of services between Bramley and Rodley.
"I agree with them, and ask that you would increase services on this route.
"In a previous letter to me, you mentioned that the service has recently been reduced, and that there are now just four journeys per day in one direction and five in the other.
"I believe that this is an unacceptable level of service, and ask that you would increase it, so that residents in Rodley can travel to Bramley and Leeds more easily."
A spokesman for First said: "We are in communication with Ms Reeves on this matter and we will be carrying on our discussions with her."
The two groups calling for more consideration to be given to the needs of city passengers are Fair Fares For All and the Leeds Student Bus Campaign.
Fair Fares For All was formed earlier this year in response to ticket price changes by First.
Its work has been backed in an Early Day Motion tabled in the House of Commons by Leeds North West MP Greg Mulholland.
The Leeds Student Bus Campaign is calling for better services in Headingley, Hyde Park and the rest of the city's university heartland.
A joint day of action planned by the groups fell victim to the recent bad weather but is being rearranged for early next year.