The CARB Hybrid and Zero-Emission Truck and Bus Voucher Incentive Project (HVIP) program vouchers from the California Air Resources Board incentivize the adoption of zero-emission trucks and buses. These vouchers help companies offset the cost of buying or leasing new vehicles that produce no harmful emissions and reduce the state's air pollution. The significance of these vouchers is that they encourage trucking companies like AJR Trucking to invest in newer, cleaner technologies.