I am sure their driving laws are like these

1. For every 100m you drive you horn 1 time
2. For every time you want to cut someone’s path, you horn; if they don’t give way, horn until they give way
3. For every time someone want to cut you, you horn; if they refuse to back off, horn further until they back off
4. Horn for no reason other than to signify your presence on the road