Record numbers expected at Great Dorset Steam Fair
Organisers of the Great Dorset Steam Fair have said the opening day of the event has been the busiest in its 42-year history.
A spokeswoman said the exact number of visitors was not yet known but it had been "exceptionally busy".
About 250,000 people are expected at the five-day event at Tarrant Hinton.
Dorset Police said traffic was particularly heavy in the area and advised motorists to avoid the A354 and other routes around Blandford.
The first day featured monster trucks and the Royal Signals White Helmets display team.
In the days before the event, traffic was disrupted when a convoy of three steam locomotives travelled at 5mph (8km/h) to the site.
The 75-tonne convoy, which is being shown at the fair, was 26m (86ft) long, 2.5m (8ft) wide and set off from Horsham, Sussex in the early hours of Friday.