Here is a stopping distance calculator I found on the Web based on the speed you are traveling before you need to brake. http://www.csgnetwork.com/stopdistcalc.html Braking time is not a simple linear relationship to that of the speed you are traveling. Findings: Speed Stopping Distance 50 km/hr 32 meters 80 km/hr 81 meters 100 km/hr 127 meters 120 km/hr 184 meters 180 km/hr 413 meters. So you if you are traveling at 180km/hr, you are a danger to yourself and to others.
from the article: Israeli driving set to get faster