A High Occupancy Toll (HOT) lane combines carpool lane and toll road concepts: vehicles meeting minimum occupancy requirements (typically 2+ passengers) can use the lane free, while single-occupant vehicles can pay a toll for access. This approach maximizes lane utilization—when carpool traffic doesn't fill the lane, paying single-occupant vehicles can use the remaining capacity. Toll rates often vary based on real-time traffic conditions, increasing when the lane is congested to maintain traffic flow. HOT lanes provide travel time savings for both carpoolers (free access) and solo drivers willing to pay for faster trips. Revenue can fund transportation improvements. HOT lanes exist in several Canadian cities and are being considered for others. Critics argue HOT lanes create "Lexus lanes" favouring wealthy drivers, while supporters note they improve road efficiency and generate revenue while maintaining free carpool incentives.