Glasgow 2014 organisers have apologised after spectators were left waiting as long as two hours for park and ride buses.
Today has been the busiest day of action to date with more than 350,000 spectators scheduled to watch free and ticketed events on 'Super Sunday'.
But the volume of people overwhelmed transport links at park and ride facilities.
Bike mechanic Gareth Allen tweeted: "Been standing in a stationary queue at Silverburn park and ride for over an hour. Very poor organisation and communication Glasgow 2014."
Catherine McLaughlin tweeted: "We are missing the start of Athletics event due to massive P&R fail at Silverburn."
Others tweeted that they had been waiting as long as two hours, and Glasgow 2014 organisers had to lay on extra buses in an attempt to get spectators to the stadium on time.
Glasgow 2014 director of transport and logistics Michael Renshaw said: "Today is the busiest day of the Games with more than 180,000 people attending ticketed sports events.
"We're aware some spectators experienced queues at some park and ride facilities today and thank them for their patience. We are working hard to ensure this service gets people to and from venues as smoothly as possible."
Glasgow City Council leader Gordon Matheson praised the people of Glasgow for their support on Super Sunday.
"Records have been broken and medals have been won but it has been the people of Glasgow who have stolen the show," he said.
"The city has come alive with hundreds of thousands of people enjoying the festival atmosphere and cheering on the world's best athletes.
"Glasgow is a city that knows how to party and it has been fantastic to see so many people having the time of their lives over the past few days. The city centre is jumping as we celebrate the biggest party Scotland has ever seen.
"The atmosphere around the city's streets and on Glasgow Green for the marathon was electric and again proves that people make Glasgow."
Super Sunday saw competition in athletics, badminton, boxing, track cycling, hockey, lawn bowls, netball, rugby sevens, shooting, squash, swimming, table tennis and weightlifting.
Thousands cheered on athletes taking part in the marathon.
Despite the damp conditions, large crowds gathered along the 26.2-mile course, which took in some of the city's landmarks.
Australia's Michael Shelley took the first athletics gold of the Games as the runner-up from four years ago secured the men's marathon crown.
Shelley crossed the line to win the men's race with a personal-best time of two hours, 11 minutes and 15 seconds.
Kenya's Flomena Cheyech Daniel took the women's crown finishing in two hours, 26 minutes and 45 seconds.
Derek Hawkins was the home nation's best performer in the men's competition, crossing the line ninth, while fellow Scottish runner Susan Partridge finished sixth in the women's race.