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In most cases, California’s Constitution requires a thumbs-up from voters before issuing bonds for projects like freeway repairs and school gymnasiums. (See, for example, hundreds of revenue initiatives on the Nov. 8 ballot).

One type of bond, however, is spared from that test.

State law requires no voter approval to issue so-called revenue bonds. Those are bonds supported with revenue generated by the project itself — for example, tolls that help pay off bonds used to build a bridge.

That’s where Proposition 53 comes in.

The measure, backed by the state Republican Party and numerous groups focused on lowering taxes, proposes extending the voter requirement to revenue bonds for projects that cost more than $2 billion.