In some implementations, a mobile device transmits traffic information to a server for analysis. The traffic information includes 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 and/or stop lights. The traffic information is analyzed to determine durations of stops at stop signs and/or stop lights. The durations of stops are associated with a time of day and/or day of the week. In some implementations, navigational routes are determined based stop sign and/or stop light information, including the delays attributable to detected stop signs and/or stop lights.