I often tell wifey how brilliant it would be if all vehicles are equipped with mics and speakers... So, instead of just honking at each other, drivers could just yell through those mics... 

This idea came when I was in a car & other drivers started to flash their headlights... It made me nervous because I didn't know what they were trying to tell me... "Is there a roadblock ahead? Is there an accident?" 

So, I thought, it'll be easier if they could just tell me what's in front using microphones... "ROADBLOCK KAT DEPAN HOI! KALAU ROADTAX MATI, PATAH BALIK!!" 

Just imagine how convenient it would be... 

When there's a slow driver on the fast lane & you're in a rush, you can just yell through those speakers, "HOI, KURA2!! KE TEPI LA BODOH!!!" instead of giving them the high beam... 

and the slow driver could reply, "JAP! JAP! ADA KANCIL KAT DEPAN AKU NI TAKNAK KE TEPI!" 

Then, if you're just bored, you can have a karaoke session with other drivers... "OKEY, MARI KITA NYANYI LAGU RAYA RAMAI! OOOOHHHHHH BALIK KAMPUNG! OHHHHOOOOHOOOO BALIK KAMPUNG!!!" 

You could also cari pasal with other drivers... Sound sikit annoying drivers... 

"ELLEH, BUKAN MAIN CILOK2 TADI... TAKDE LA JAUH MANA PUN KAU" 

or 

"WIRA PERASAN LANCER!!!! HAHAHAHAHAHA!!" 

The downside would be sound pollution... Many people would share with the rest of the world their taste in music... Cursing while driving wouldn't be done privately... The roads would be so noisy...