Coelognathus radiatus
Copperhead Racer

Total length Average 150 cm, can reach 210 cm.
Description Back brownish, yellowish or greyish, with 4 black stripes which broken into streaks on the neck.
Stripes distinct on the anterior half of the body, fade and disappear further down.
Head with black collar, 3 black lines radiate from behind each eye.
Ventrals greyish; Scales weakly keeled.
Habitat Prefer open, dry, hilly, rocky habitat in grassland and shrubland.
Seldom in high mountain and broad-leaf woodland.
Absent from the interior of dense forest.
Behaviour Diurnal. Active and fast-moving snake.
Vicious and aggressive.
When threatened, inflates the neck to show bluish skin, bend the anterior half of body into loops and mouth widely open.
Will strike and bites when handled.

Thanks Zep! Thanks Alan! That's him! They say agressiv and vicious but they don't say if he is venimous in fact!

Danger to humans: This snake is aggressive when threatened and is large enough to inflict some damage with its bite. A recent study has found that it produces some venom, quite similar to the venom of cobras. However, it only produces a small amount of venom and does not have venom-injecting fangs, so effects in humans are limited to redness and mild swelling at worst.

That was definitely a copper head racer I saw, but I was surprised to hear that they have venom and are aggressive. I somehow thought they were harmless, so probably did not treat it with sufficient respect. I'm not an expert on distinguishing the venomous from the non-venomous, so tend to err on the side of caution.