Instructions: Generate an appropriate single-sentence summary for the given text such that it includes the main topic of the text.
Input: The government introduced a transport bill to shake up bus services and introduce low emission zones in cities. In a new report, the rural economy committee urged ministers to "clarify" and strengthen a series of provisions. Major changes to the bill are already planned, with a new workplace parking levy to be added at stage two already raising controversy with MSPs. The committee warned that it will be "essential" for them to scrutinise the parking levy amendment in full, which may see the passage of the bill prolonged. The transport bill was published in June 2018, outlining plans for changes to halt a decline in bus passenger numbers. It includes plans to give local councils and regional transport partnerships (RTPs) more flexibility to improve services, either by working with bus companies or by stepping in and running services themselves. It also provides for a ban on double parking and parking on pavements, powers for enforcing low-emission zones in cities and new regulations overseeing roadworks. While recommending that MSPs pass the bill at stage one, the committee outlined a lengthy series of concerns and recommendations for changes when the bill comes back to them for stage two. These include: The committee also said they were "concerned" that plans to give councils the power to levy a workplace parking tax are only to be added to the bill at stage two. They said it was "essential" they were given time to fully scrutinise the potential impact of these plans, which have dominated much of the debate of the budget deal between the SNP and the Greens. 'Greater clarity' Committee convener Edward Mountain said: "Having listened to a wide-range of evidence from stakeholders and individuals, the committee supports the general principles of the Bill which considers a number of different transport elements, including smart ticketing, low emission zones, pavement parking restrictions and tools intended to help improve bus services. "However, greater clarity is required on a number of issues as the bill continues its parliamentary passage." Opposition parties have described the bill as a "missed opportunity", and are planning amendments of their own. A spokesman for Transport Scotland welcomed the committee report, saying the bill "aims to improve journeys for people across the country by developing cleaner, smarter and more accessible network". He added: "We are confident the bill will empower local authorities and establish consistent standards where required, and also give them means to address local transport needs as appropriate. "It is a broad piece of legislation and we will now go on to consider this report in more detail to establish where individual points can be addressed."
Output:
MSPs have called for widespread changes to transport reforms being planned at Holyrood.