Which customer feedback-driven feature was NOT part of the original ride-hailing apps but became standard by 2015 after overwhelming user requests?

The transportation industry has undergone massive changes with the rise of ride-hailing services. These platforms have disrupted traditional taxi services, changed urban mobility patterns, and transformed how consumers interact with transportation options. This trivia question focuses on customer feedback that led to a pivotal feature now standard across ride-hailing apps worldwide. Test your knowledge of how customer insights shaped these revolutionary transportation services!

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In-app driver tipping functionality
Real-time GPS tracking of approaching vehicles
Rider ratings for drivers
Upfront fare estimation before booking