[dragonwriter]

I suspect the Bay Area model is more common where the dominant traffic on a bridge is two-way commute traffic that can’t easily escape the toll regime for one side of the commute. In that case, one-way tolls reduce infrastructure and operating costs, and traffic impacts, of toll collection without any significant downside.

[duskwuff]

The other half of that is a practical matter -- collecting tolls in both directions means constructing and staffing a larger and more complex toll plaza. It's hard to justify that expense unless a lot of tolls will go uncollected without it.

[dragonwriter]

> The other half of that is a practical matter -- collecting tolls in both directions means constructing and staffing a larger and more complex toll plaza

That’s part of what I waa getting at with “infrastructure cost”, yes.