Was in the right lane driving 74mph about a 1/4 of a mile behind another vehicle who swerved & hit their brakes when they seen the police (I assume). They may have been half asleep, texting, talking….whatever. Nevertheless, I immediately moved to the left lane, passed them, & kept it moving. The police pulled out, driving behind them first, then eventually pulled me over!! The reason was…. “drove left lane not passing”. I was so confused as I attempted to explain to the officer if he saw me in the left lane, then surely he had to have seen the car that swerved- thus the reason why I was in the left lane anyway!! Nevertheless, I decided that battle was not worth fighting for several reasons.