Correct sample rate to 4 Hz

README.md

@@ -12,7 +12,7 @@ For more information and a script for downloading and unpacking visit our [GitHu
 
 ## Dataset Features
 
-- **High-Quality Data:** 5,134 routes with 100 % route completion and zero infractions on 8 towns, sampled at 2 Hz, totaling 581,662 frames
+- **High-Quality Data:** 5,134 routes with 100 % route completion and zero infractions on 8 towns, sampled at 4 Hz, totaling 581,662 frames
 - **Diverse Scenarios:** Covers 38 complex scenarios, including urban traffic, participants violating traffic rules, and high-speed highway driving
 - **Focused Evaluation:** Short routes averaging 160 m in length