SAN FRANCISCO -- Orange-and-black clad hordes began flooding the streets of San Francisco on Wednesday for a Halloween Day ticker-tape parade celebrating the 2012 World Series champion Giants.

Three hours before the start of the parade, thousands of people decked out in Giants gear or Halloween costumes were already staking out prime spots behind barriers along Market Street.

Vendors also got an early start hawking everything from pennants to lawn chairs from makeshift sidewalk stands amid the crush of the morning commute.

Fans also gathered at City Hall, where the team will address the crowd after the parade.

Numerous commuter trains were delayed as revelers crammed onboard, and some travelers were turned away from ferry service from Marin County.

With the victory parade coinciding with the spooky holiday, costumed masses were expected to bring an even more festive feel to what city officials stressed will be a family friendly, alcohol-free event.

"This was such a team effort to win the World Series, so we decided we'd get our city team together to make sure we have a great celebration," Mayor Ed Lee said Tuesday as he stood with police, fire, transportation and other officials at City Hall.

After the Giants won the Series in 2010, hundreds of thousands of revelers – from school-age children to longtime fans who had waited decades for a championship – crammed into downtown to cheer on their heroes.

This year's parade route is different than it was in 2010, when a vehicle carrying the "Say Hey Kid" Willie Mays led players and coaches in open-air buses designed to look like cable cars down the same route that Mays' Giants took in 1958 after relocating from New York.

That route started at Montgomery Street in the Financial District and turned onto Market Street. The 2012 edition will begin at the foot of Market near San Francisco Bay and cover about 1 1/2 miles to City Hall.

Each player will have an open-top vehicle, so fans will get a view from all sides.

San Francisco police Chief Greg Suhr said the parade will last about two hours. He warned people not to try to drive into the area during the day.

The city spent Monday cleaning up after a rowdy celebration Sunday night turned violent in some neighborhoods and police arrested three dozen people. Bonfires of trash were lit in several intersections, and a $700,000 public transit bus was torched.

The World Series victory parade in 2010 occurred with little incident, and officials said they expect a peaceful encore Wednesday.

Given the anticipated flood of people, officials increased public transportation during the parade.

San Francisco's subway continued to run through all stations along the parade route, Bay Area Rapid Transit commuter trains will run at rush hour levels all day; and ferries will be running special service throughout the festivities.

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  • Barry Zito, Amber Seyer

    San Francisco Giants pitcher Barry Zito waves while sitting next to his wife, Amber Seyer, during the baseball team's World Series victory parade Wednesday, Oct. 31, 2012, in San Francisco. The team's second championship parade in three years parade ended with a celebration in front of City Hall. (AP Photo/Marcio J. Sanchez)

  • Marco Scuataro

    San Francisco Giants second baseman Marco Scutaro, of Venezuela, gives a thumbs up to people lining balconies during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012 in San Francisco. The parade for the team's second championship in three years ended with a celebration in front of City Hall. (AP Photo/Marcio J. Sanchez)

  • People cheer San Francisco Giants pitcher Tim Lincecum as he passes in the baseball team's World Series victory parade on Market Street, Wednesday, Oct. 31, 2012, in San Francisco. The team's second championship parade in three years went along Market Street and ended with a celebration in front of City Hall. (AP Photo/Nic Coury)

  • Larry Baer, Ed Lee

    San Francisco Giants CEO Larry Baer, left, laughs after being presented the key to the city and a gold broom from San Francisco Mayor Ed Lee, right, during the baseball team's World Series victory celebration at City Hall, Wednesday, Oct. 31, 2012, in San Francisco. The team's second championship in three years included a parade along Market Street and ended with a celebration in front of City Hall. (AP Photo/Marcio J. Sanchez)

  • Pablo Sandoval, Marco Scutaro

    San Francisco Giants' Pablo Sandoval, left, and Marco Scutaro speak during a ceremony celebrating the baseball team's World Series victory at City Hall in San Francisco, Wednesday, Oct. 31, 2012. (AP Photo/Jeff Chiu)

  • San Francisco Giants players pose for photographs after a ceremony celebrating the baseball team's World Series victory at City Hall in San Francisco, Wednesday, Oct. 31, 2012. (AP Photo/Jeff Chiu)

  • Tony Bennett

    Singer Tony Bennett raises his arms as he is surrounded by players from the San Francisco Giants after a ceremony celebrating the baseball team's World Series victory at City Hall in San Francisco, Wednesday, Oct. 31, 2012. (AP Photo/Jeff Chiu)

  • Pablo Sandoval, Marco Scutaro

    San Francisco Giants third baseman Pablo Sandoval, left, and second baseman Marco Scutaro, right, of Venezuela, smile while standing at the podium during the baseball team's World Series victory celebration at City Hall Wednesday, Oct. 31, 2012, in San Francisco. Sandoval was the World Series MVP and Scutaro was the MVP of the National League Championship Series. The team's second championship in three years included a parade along Market Street and ended with a celebration in front of City Hall. (AP Photo/Marcio J. Sanchez)

  • San Francisco Giants pitcher Sergio Romo looks up as confetti falls during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

  • Buster Posey

    San Francisco Giants catcher Buster Posey waves and is showered with confetti during the Giants' baesball World Series victory parade on Market Street in San Francisco, Wednesday, Oct. 31, 2012. (AP Photo/Marcio J. Sanchez)

  • San Francisco Giants pitcher Matt Cain, his wife Chelsea, and daughter Hartley ride in a car as confetti falls during the San Francisco Giants World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Jeff Chiu)

  • San Francisco Giants Pablo Sandoval holds the MVP trophy as kids wait for his autograph before the start of the victory parade in San Francisco, Wednesday, Oct. 31, 2012. The Halloween Day World Series victory parade is perfectly suited for the hundreds of thousands of orange-and-black-clad Giants fans expected to flood into the city. The team's second championship in three years will head down Market Street Wednesday afternoon and end with a celebration in front of City Hall. (AP Photo/Marcio Jose Sanchez)

  • DeDe Krake, left, and Stacy Hunt, right, of Auburn, Calif., carry a tiger on a broom while walking along Market Street before the start of the San Francisco Giants World Series victory parade Wednesday, Oct. 31, 2012 in San Francisco. The team's second championship in three years goes along Market Street and ends with a celebration in front of City Hall. (AP Photo/Eric Risberg)

  • People line Market Street before the start of the San Francisco Giants World Series victory parade Wednesday, Oct. 31, 2012 in San Francisco. The team's second championship in three years goes along Market Street and ends with a celebration in front of City Hall. (AP Photo/Eric Risberg)

  • Pearl Garvin, of Mountain View, Calif., holds a sign while waiting on Market Street for the start of the San Francisco Giants World Series victory parade Wednesday, Oct. 31, 2012, in San Francisco. The team's second championship in three years goes along Market Street and ends with a celebration in front of City Hall. (AP Photo/Eric Risberg)

  • Fans hold up their children, cousins Reagan Hagerstrand, 10-months, and Ryan Magnani, 1, right, during the San Francisco Giants World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Jeff Chiu)

  • Fans cheer at the start of the San Francisco Giants World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. The Giants swept the Detroit Tigers in three games to win the World Series. (AP Photo/Marcio Jose Sanchez)

  • San Francisco Giants manager Bruce Bochy hugs fan Jackie Day, 14, before the San Francisco Giants World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Jeff Chiu)

  • Pablo Sandoval

    San Francisco Giants third baseman and World Series MVP Pablo Sandoval waves while riding in the baseball team's World Series victory parade on Market Street in San Francisco, Wednesday, Oct. 31, 2012. (AP Photo/Marcio J. Sanchez)

  • Pablo Sandoval

    San Francisco Giants third baseman and World Series MVP Pablo Sandoval is showered with confetti on Market Street while riding in the baseball team's World Series victory parade in San Francisco, Wednesday, Oct. 31, 2012. (AP Photo/Marcio J. Sanchez)

  • San Francisco Giants pitcher Brian Wilson rides in a cable car during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

  • From left, San Francisco Giants fans Alison Griffith, Katie Peck and Beth Giotta cheer during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

  • San Francisco Giants pitcher Sergio Romo holds up a flag during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Jeff Chiu)

  • San Francisco Giants pitcher Sergio Romo rides in a car during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Jeff Chiu)

  • San Francisco Giants pitcher Sergio Romo rides in a car during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

  • Marco Scutaro

    San Francisco Giants second baseman Marco Scutaro, of Venezuela, waves while riding in the car at lower left during the baseball team's World Series victory parade on Market Street, Wednesday, Oct. 31, 2012, in San Francisco. Scutaro was the MVP of the National League Championship Series. The parade for the team's second championship in three years went along Market Street and ended with a celebration in front of City Hall. (AP Photo/Eric Risberg)

  • San Francisco Giants manager Bruce Bochy holds the World Series trophy as confetti falls during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Jeff Chiu)

  • San Francisco Giants catcher Buster Posey and his wife Kristen ride in a car as confetti falls during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Jeff Chiu)

  • San Francisco Giants pitcher Tim Lincecum acknowledges fans during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

  • San Francisco Giants fans cheer during the team's World Series baseball victory parade, Wednesday, Oct. 31, 2012 in San Francisco. (AP Photo/Marcio Jose Sanchez)

  • San Francisco Giants pitcher Tim Lincecum acknowledges fans during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

  • Fans Elizabeth Santos, left and Joseph Foranda wear World Series trophy hats during the San Francisco Giants' baseball World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco.(AP Photo/Sanchez)

  • San Francisco Giants fans cheer during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Jeff Chiu)

  • San Francisco Giants' Marco Scutero, his wife Marines and their daughter Valeria ride in a car during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

  • Confetti rains down on people lining Market Street during the San Francisco Giants' World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. The parade for the team's second baseball championship in three years went along Market Street and ended with a celebration in front of City Hall. (AP Photo/Eric Risberg)

  • San Francisco Giants pitcher Matt Cain, his wife, Chelsea, and daughter Hartley ride in a car as confetti falls during the baseball team's World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco.(AP Photo/Marcio Jose Sanchez)

  • Fans cheer during the San Francisco Giants' baseball World Series victory parade, Wednesday, Oct. 31, 2012, in San Francisco. (AP Photo/Marcio Jose Sanchez)

  • The cars of San Francisco Giants catcher Buster Posey, foreground, and third baseman Pablo Sandoval are showered with confetti during the baseball team's World Series victory parade on Market Street, Wednesday, Oct. 31, 2012, in this view from the top of the Sheraton Palace hotel in San Francisco. The team's second championship in three years went along Market Street and ended with a celebration in front of City Hall. (AP Photo/Eric Risberg)

  • The San Francisco Giants' World Series victory parade makes its way along Market Street, Wednesday, Oct. 31, 2012, in San Francisco. Riding in the foreground car is team President Larry Baer followed by the ownership group in motorized cable cars and the team's Hall of Fame players. The parade for the team's second baseball championship in three years went along Market Street and ended with a celebration in front of City Hall. (AP Photo/Eric Risberg)

  • The cars of San Francisco Giants catcher Buster Posey, foreground, and third baseman Pablo Sandoval are showered with confetti during the baseball team's World Series victory parade on Market Street, Wednesday, Oct. 31, 2012, in San Francisco. The parade for the team's second championship in three years went along Market Street and ended with a celebration in front of City Hall. (AP Photo/Eric Risberg)

  • The cars of San Francisco Giants catcher Buster Posey, foreground, and third baseman Pablo Sandoval are showered with confetti during the baseball team's World Series victory parade on Market Street, Wednesday, Oct. 31, 2012, in this view from the top of the Sheraton Palace hotel in San Francisco. The parade for the team's second championship in three years went along Market Street and ended with a celebration in front of City Hall. (AP Photo/Eric Risberg)

  • Pablo Sandoval

    San Francisco Giants third baseman and World Series MVP Pablo Sandoval is showered with confetti on Market Street while riding in the baseball team's World Series victory parade in San Francisco, Wednesday, Oct. 31, 2012. (AP Photo/Marcio J. Sanchez)

  • Hunter Pence

    San Francisco Giants right fielder Hunter Pence, at podium, leads the team in a cheer during the baseball team's World Series victory celebration at City Hall, Wednesday, Oct. 31, 2012, in San Francisco. The team's second championship in three years included a parade along Market Street and ended with a celebration in front of City Hall. (AP Photo/Marcio J. Sanchez)

  • SFGiants World Series Parade

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  • SF Giants Parade 2012

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  • Confetti from Heaven

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  • Family and "Giant" Heads

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  • Daddy and Daughter

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  • Hunter!

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  • Hunter Pence showing the love

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  • Giants Parade- Willie Mays

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