On Nov. 7, voters will be asked to approve the "Highway Safety, Traffic Reduction, Air Quality and Port Security Bond Act of 2006." The bond is part of broader package that would provide money for an array of public works projects.

At $19.9 billion, Proposition 1B is the single largest bond ever put before California voters and is larger than the annual general fund budgets of 41 states. The measure has been touted largely as a vehicle to improve roads and ease congestion, but just more than half the money would go toward such projects.

The rest would be used for transit systems, air quality improvement, safety measures and other expenditures. How the bond money is divided:

ROADS: $11.3 billion

* $4.5 billion for reducing traffic in "high-priority corridors" along state highways and major roads. State officials haven't yet determined which roads would be eligible for funding.

* $2 billion to increase highway, road and transit capacity.

* $2 billion to improve local roads.

* $1 billion to add lanes and interchanges to sections of Highway 99 in the Central Valley.

* $750 million for the state's primary fund for highway safety projects.

PUBLIC TRANSIT: $4 billion

* $3.6 billion to improve local rail and transit services, including buying vehicles and rights of way.

* $400 million to improve intercity rail, including buying railcars and locomotives.

MOVEMENT OF GOODS: $2 billion

* $2 billion to "improve movement of goods" on state highways and rail systems and in ports. Officials say this money could be used to build toll roads for diesel trucks and to purchase new equipment for ports.

AIR QUALITY

* $1 billion to reduce emissions, presumably from trucks and trains. Lawmakers did not specify what would be included in the program, nor who would be authorized to spend the money.

* $200 million to retrofit and replace school buses that don't pass emission standards.

SAFETY AND SECURITY

* $1 billion to improve security and facilitate disaster response of transit systems.

* $250 million in grants to improve the safety of railroad crossings.

* $125 million in grants for seismic retrofits of local bridges and overpasses.

* $100 million to improve perimeter security and disaster planning at publicly owned ports, harbors and ferry facilities.

Source: Legislative Analyst's Office.