There seems to be a global patterns among the Anglo-Saxon nations (and perhaps others). If you have more forecasting graphs like this for other places, please send them along via the Comments, and I will update this post.
Figure 2: Historic New Zealand light vehicle traffic forecasts vs actual growth Source: http://www.transport.govt.nz/ourwork/keystrategiesandplans/strategic-policy-programme/future-demand/
U.S. DOT highway travel demand estimates continue to overshoot reality (SST By Eric SundquistI) http://www.ssti.us/2014/03/u-s-dot-highway-travel-demand-estimates-continue-to-overshoot-reality/
UK National Transport Model consistently overestimates future car use Source: http://road.cc/content/news/137057-cycling-revolution-rolling-backwards’-according-figures-–-car-use-rise-still
Some additional forecasts and/or trends from the comments and elsewhere
Are Australians driving more (or a lot less?) via Alan Davies
Source: http://www.estradasdeportugal.pt/index.php/pt/informacoes/estudos/871-concessoes-rodoviarias-um-novo-paradigma-operacional (Portuguese) via Marcos Paulo Schlickmann
Washington State forecasts for SR-520. Source: Sightline Institute
Port Mann Bridge, British Columbia Source: Sightline Institute
Traffic volumes across Waitemata Harbour. Source:
Intercounty Connector Source: Image by Claire Jaffe
In other fields
Forecasts of Treasury Yields vs. reality.
Delphi Energy Forecast
Jevons Coal Forecast
Evolution of Brent Oil Forecasts: Source:
Past Economic Outlook projections of euro area GDP
Demographic Changes: Revisions to Japan’s Total Fertility Rate Forecasts
Why have the IEA’s projections of renewables growth been so much lower than the out-turn?
“The energy world is undergoing massive transformation. Installations of renewable energy have skyrocketed around the world, exceeding most predictions from less than a decade ago. ” Source:
State Revenue Forecasts are becoming increasingly wobbly. Source.
Aurelija Augulyte (@auaurelija) 6/12/15, 03:44 writes: but hey don’t worry about Sweden. #Riksbank has it all under control. pic.twitter.com/NWdZfvUpaG
Gusher of Disappointment : Each month forecasters in the Wall Street Journal’s survey of economists have predicted that oil prices would climb. Each forecast is the average of responses to that month’s survey.
Falling inflation. Forecasters have expected inflation, as measured by the Consumer-price index, to rise more quickly toward the Fed’s 2% larger. Each forecast is the average of responses of that month’s survey.
Effective fed funds rate and forward rates implied by futures contracts
Projection of total deaths, United Kingdom, 1966-2030, Selected projections