Traffic Alert Taiwan is a free Android app developed by CoolApps.mobi. The app's main purpose is to assist drivers in detecting speed and traffic light cameras on the road, alerting them instantly before 1-3km ahead. This feature gives users sufficient time to slow down their car speed to avoid any penalties.

The app has a fully automated detection system, and by default, the alert is based on camera locations provided by the Transport Department. Users can also define their own checkpoint alert similarly to functionality in Default Alert, using the Custom Alert feature. The app triggers distance alerts in 2km, 1km, and 500 meters respectively. Additionally, the app triggers overspeed alerts only if the speed limit is exceeded.

The app has an auto-instant update alert data on the air for subscribers and an auto start-up detection feature that recognizes when the user is in driving mode. The app also has a full human voice alert feature.

However, the app requires GPS to be turned on for detection based on the current device's location. Android 6.0 or above requires permission to access the device's location.

Overall, Traffic Alert Taiwan is an excellent app that helps drivers avoid penalties without having to worry about speed cameras and traffic light cameras.