After effects (“hangover”) include insomnia, nocturia, tiredness, nausea, and headache. People become garrulous, elated, and aggressive at concentrations above 21.7 mmol/l (100 mg/100 ml) and then may stop drinking as drowsiness supervenes. At 17.4 mmol/l (80 mg/100 ml)-the current legal limit for driving in the United Kingdom-the risk of a road traffic incident more than doubles, and at 34.7 mmol/l (160 mg/100 ml), it increases more than 10-fold. In a simulated driving test, for example, bus drivers with a blood alcohol concentration of 10.9 mmol/l (50 mg/100 ml) thought they could drive through obstacles that were too narrow for their vehicles. Even at a low blood alcohol concentration of around 6.5 mmol/l (30 mg/100 ml), the risk of unintentional injury is higher than in the absence of alcohol, although individual experience and complexity of task have to be taken into account. Increasing consumption leads to a state of intoxication, which depends on the amount drunk and previous experience of drinking.
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