Uber Technologies Inc. struck a last-minute deal to avert a cap on new car-service vehicles in New York City Wednesday, a limitation the company claimed would stunt its growth in the country's biggest taxi market.

Smartphone-driven Uber had launched a furious lobbying, advertising and social-media campaign to get the city's leaders to shelve a proposed yearlong cap on new for-hire vehicles, which city officials worry may be contributing to congestion and pollution.

Uber, which faced a City Council vote on the cap as soon as Thursday, agreed to participate in a traffic study and turn over detailed trip data. City officials said they may seek a cap later.

The deal appeared to end what had become an increasingly nasty fight between the car service and Mayor Bill de Blasio, and it added New York to a list of major cities around the world where the San Francisco-based company has faced—and so far avoided—limitations on its growth.

Faced with a potential cap, Uber took aim at New York's liberal mayor, challenging him to a debate, attacking his progressive credentials in television ads and even needling him on its app with a "de Blasio" feature that says "no cars available."

At stake was Uber's bite of the Big Apple's chunk of the country's taxi market, and traffic in Manhattan's central business district, where city officials say ubiquitous black cars-for-hire are swarming the already congested streets waiting for fares. IBISWorld Inc. estimates the U.S. taxi and limousine market's size at $12 billion.

Uber and other car services have more than 63,000 vehicles on the streets of New York, their telltale special license plates in the mix of buses, delivery trucks, and yellow cabs. The overall fleet is up 60% since 2011.

The boom has been fueled in large part by Uber, which launched in New York City in 2011 and now counts about 20,000 vehicles in the five boroughs. The company's fleet dwarfs that of New York City's approximately 13,600 yellow taxis.

While Uber cars are rolling around the globe, much of the company's fortunes are tied to New York, its largest U.S. market, where its drivers have ferried more than 2.5 million customers since it launched. Key to its strategy has been cultivating grass roots support.

Uber drivers say they appreciate their jobs' flexibility, which enables them to set their own hours and how much they earn. Some even expressed support for the proposed cap—to protect their own incomes. "We're going to have a lot of drivers and not going to have jobs," said Predrag Kumanovic, 34 years old, a yellow-taxi defector who now drives for Uber.

Uber's bare-knuckled tactics marked a change in its tone in New York City, where both the company and regulators say they once worked on friendlier terms. Upon the urging of New York officials, the company has added a service with wheelchair-accessible vehicles and, during emergencies, agreed to cap fares charged by its "surge pricing" system.

When it launched in New York City in 2011, Uber ditched its common "ride-sharing" model under which nonprofessional drivers accept rides the company arranges via its smartphone app. Instead, Uber acceded to the Taxi and Limousine Commission's demands that it set up shop as a regulated black-car service, with city-licensed professional drivers, vehicles and bases.

But the company has vigorously battled any caps, arguing that system undermines its elastic supply-and-demand model. As demand for its service grows in each city, Uber's system entices more drivers to sign up and fulfill that demand, keeping down wait times.

In New York, Uber says it is seeing about 25,000 new riders a week. The average wait time for pickups in Manhattan has fallen to less than three minutes, down from more than 10 minutes a few years ago, according to the company.

"Demand is growing really fast," said Josh Mohrer, Uber's general manager in New York. "If supply doesn't grow in lock step with that, the service will get unreliable."

In early 2014, Seattle became the first city to impose a cap on Uber and its ride-sharing competitor, Lyft, but the city eventually lifted the cap in a compromise. In May, London Mayor Boris Johnson floated the idea of capping the number of nontaxi car services in the city, arguing they are clogging the roads and pushing aside traditional black cabs.

A cap in New York could have curbed Uber's appeal to potential investors. The company, already the most highly-capitalized venture-backed startup, is in talks with investors to raise more than $1.5 billion in additional capital, valuing it at more than $50 billion.

In its fight against New York's proposed cap, the company accused the mayor of doing the bidding of political donors in New York's yellow-taxi industry. Mr. de Blasio, in turn, had accused the company of "putting [its] profits over all other considerations."

City officials suspect that for-hire vehicles, whose numbers aren't currently capped, could be a prime suspect in increased congestion in Manhattan's central business district.

They point to average speeds there that had declined to 8 miles an hour in May, from 9.4 mph in 2010. Given that the number of cars entering Manhattan has declined steadily in recent years, officials suspect that for-hire vehicles could be cruising for fares and slowing down traffic.

Uber said the temporary cap could have limited its growth to 200 new cars instead of the 10,000 new vehicles the company has expected to add over the next year.

Meera Joshi, chairwoman of New York City's taxi commission, said data indicates about 70% of Uber's pickups have been within Manhattan's central business district. Meanwhile, Ms. Joshi said the city has been adding about 1,200 net new for-hire vehicles a month.

The mere discussion of a cap may have led to some unintended consequences. Ms. Joshi said the taxi commission has seen a rush for vehicle licenses before a potential cap. Uber's Mr. Mohrer said the fight with City Hall yielded "great advertising for us."

Write to Andrew Tangel at Andrew.Tangel@wsj.com and Douglas MacMillan at douglas.macmillan@wsj.com

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