In some implementations, a mobile device can transmit traffic information to a server for analysis. The traffic information can include movement information including detected stops and durations of detected stops. The traffic information is analyzed to detect traffic patterns that indicate locations of stop signs or stop lights or both. The traffic information can be analyzed to determine durations of stops at stop signs or stop lights or both. The durations of stops can be associated with a time of day or day of the week or both. In some implementations, navigational routes can be determined based stop sign or stop light information or both, including the delays attributable to detected stop signs or stop lights or both.