They forgot a small detail...


One of my fauvorites… A toll road PPP.

Beautiful business model.

Traffic studies.

Economic growth projections.

Sophisticated demand modelling.

Consultants everywhere.

Like queuing for free ice-cream…

The road opened in 2007.

The project was the South Bay Expressway SR‑125 toll road.

Everything looked perfect on paper.

Except for one small detail.

Drivers.

They didn’t show up.

The financial model predicted tens of thousands of vehicles per day.

Reality?

Sometimes traffic was 70–80% lower than forecast.

Which is a polite way of saying:

The road was empty.

Very empty.

And the consultants “la j0dieron”…

The investors were led by Macquarie Infrastructure Group, one of the most sophisticated infrastructure investors in the world.

If anyone knew how to forecast traffic…

It should have been them.

But toll road forecasting has a nasty habit.

It looks scientific.

Spreadsheets.

Elasticity curves.

GDP projections.

Population growth.

But at the end of the day…

It’s still a prediction about human behaviour.

And humans are stubborn creatures.

They will happily sit in traffic for 40 minutes…

Just to avoid paying $4 in tolls.

Three years after opening…

The project filed for bankruptcy.

Billions invested.

Years of work.

All because the most important assumption in the model was wrong:

That people would actually use the road.

Which is why experienced PPP investors always say the same thing.

Construction risk?

Manageable.

Financing risk?

Manageable.

Political risk?

Annoying, but manageable.

Demand risk?

Terrifying.

Now, you know why availability payments is the “new big thing”…

Because when traffic is 90% below forecast…

There is no clever refinancing that can save you.

Only a very expensive lesson.

Cheaper lessons, but also full of knowledge, below:

​The 100 Q&A You Must Know about PPPs​

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