I have to honk more than a second to get them to realize I'm honking at them. And 9 times out of 10 unless I honk I won't make the light because I'm 2 cars back

I have to honk more than a second to get them to realize I'm honking at them. And 9 times out of 10 unless I honk I won't make the light because I'm 2 cars back and the people in front are either not paying attention too, or are too scared to honk. The worst are left green arrow snoozers.