The Olympic honeymoon for road and rail users has come to and end with delays set to return in the coming weeks. Long immigration queues have also been reported at airports.
Most works were suspended during the games.
This week will see major works on the M25 in Kent and Surrey. Other works are planned in Berkshire and Dorset.
Rail passengers have been hit by engineering works, signal failures and delays.
At least 35 services across the country were replaced by buses over the weekend meaning many routine journeys took far longer than usual.
In addition there were a series of signal failures with delays of at least half an hour reported between Hastings in East Sussex and Tonbridge, Kent.
Network Rail, the company responsible for the country’s track infrastructure, suspended works for the duration of the Olympics and Paralympics.
But as a result it has left a backlog which a spokesman said had to be dealt with. “We make no apologies for this.
“We made pledge during the Olympics but as a result we have had to move things around."
However it meant passengers facing bus rather than train journeys in all parts of the country from Wareham and Weymouth in south west England to north of Newcastle on the line up to Edinburgh in the North East.
The widespread engineering works will rekindle the debate over whether passengers should be charged a full train fare when they are expected to complete part of their journey by bus.
At Heathrow the immigration queues have been lengthening since the Olympics, but until now have remained within performance targets set by the Border Force.
Elsewhere there will be roadworks on the M4 on the approach into London, which was the part of the network operated by the Highways Agency.
There are also roadworks in Weymouth, which was used for the sailing during the Olympics, where special road measures had also been in force.