It was never something that worried anyone too much. It's a different picture today. Recently, major incidents on the M25 lead to thousands of passengers missing flights, not to mention the flight crews who never made it on time to transport those passengers who were there.
I live an hour from Heathrow, but my local taxi firm insists on a pick-up two-and-a-half hours before check-in for flights before noon.
Add this to a two-hour check-in and it is quicker for me to get to Paris by car, using Eurotunnel.
But with government plans for the transport infrastructure still just that, there is no prospect of an early respite from a problem that is only likely to get worse. The prospect of delegates missing flights through major traffic delays poses a logistical nightmare for organisers - arriving 12 or 24 hours late for a three-night weekend event is crazy.
While the C&I industry may join the growing lobby for better transport as well as better airports, in the interim, it seems they are going to have to factor in the cost of an overnight stay for more overseas events.
And that just means more expense for the corporate client.