英文回答：
Classification of Taxi Technology Levels.
Taxi technology has undergone significant advancements in recent years, leading to the emergence of various levels of technological sophistication. This classification system categorizes taxis based on the features and capabilities of their onboard systems:
Level 0: Basic Technology.
Conventional taxis with no advanced technological features.
Rely on traditional methods such as hail, phone calls, or taxi stands for hailing.
Limited connectivity and tracking capabilities.
Level 1: Enhanced Technology.
Equipped with mobile apps for hailing and payment processing.
Provide GPS tracking and estimated time of arrival (ETA) information.
May offer features such as fare estimation and driver ratings.
Level 2: Semi-Autonomous Technology.
Incorporate advanced safety features such as adaptive cruise control and lane departure warning.
Enable partial automation of driving functions, such as lane keeping and acceleration/deceleration.
Enhance passenger comfort and reduce driver workload.
Level 3: Conditional Automation.
Offer conditional automation in specific driving scenarios, such as highway driving or traffic congestion.
Allow drivers to disengage from driving for extended periods under certain conditions.
Require human intervention in complex or unexpected situations.
Level 4: High Automation.
Enable fully automated driving in most scenarios.
Can navigate complex traffic situations without human input.
May require human intervention in rare or emergency situations.
Level 5: Full Automation.
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