What do you do while waiting at a red light? Read emails and texts on your phone? Check Twitter and Facebook? Maybe you are drafted into fetching something a carseat-bound child flung to the nether ...

SAN FRANCISCO – You’re stuck at a red light. It’s taking forever. How much time until the light turns green? Ten seconds? Twenty seconds? A minute and a half? Would you be more patient if you knew ...

SAN FRANCISCO — You're stuck at a red light. It's taking forever. How much time until the light turns green? Ten seconds? Twenty seconds? A minute and a half? Would you be more patient if you knew ...

Reporting from San Francisco — You’re stuck at a red light. It’s taking forever. How much time until the light turns green? Ten seconds? Twenty seconds? A minute and a half? Would you be more patient ...