The first block of the day is the "morning drive time" block in the early morning. Arbitron defines this block between 6 a.m. and 10 a.m., though it can begin as early as 5 a.m. (though usually not later than 6), and end as early as 9 a.m. or as late as 11 a.m. This block usually includes news bulletins and traffic and weather advisories for commuters, as well as light comedy from the morning DJ team (many shock jocks started as or still work on drive-time radio). Some stations emphasize music, and reduce gags and call-ins in this period.