It's the most expensive option, it's the most damaging to the environment. But today, the Government confirmed a new crossing for the Thames - not at Dartford as many had expected - but down river, near Gravesend.
Exactly which route the approach roads will take is still up for debate - the consultation starts this week. But it seems those who said they wanted no more crossings at Dartford have won the day.
Derek Johnson has our report.