Regarding sending of alerts, just the work of Zhengxia and
Laisheng (2010) provided it automatically. The alerts are sent via
SMS for the monitoring users. That is an important issue, because
it reduces the response time and allows a quicker decision-making
without depending of an user. In their proposal, several events can
be alerted, such as overdue validity, long stayed goods, and damaged
goods. However, as the alerts were sent by SMS, the driver
may not notice the arrival of a SMS message on the mobile device.
This would cause a delay in decision-making and possibly losses
during logistics flow. Thus, an improvement of SMS alerts with
audible alerts would be interesting.