Arrive Alive

How Much Is Too Much To Drink Before I Drive?

How Much is Too Much to drink before I drive?

People often ask how much can they drink before they go past the limit?

Here is a "basic" answer:

1 metric tot is 8,4 g of ethyl alcohol.

The average beer contains between 13 - 16 grams of ethyl alcohol.

One beer is, therefore, the ± equivalent of a double eg brandy.

In trials, all the participants (Male & Female students) exceeded the legal limit = 0,05g/dl after two beers.

According to the Widmark formula:

A = p x c x 10 x r
A = amount of alcohol in grams
p = mass of the person
x 10 = to convert promille ( parts per thousand) to g/dl or g/%
"r" = Widmark factor which is on average 0,7 for men and 0,6 for females.
c = blood alcohol level.

Blood alcohol level = A divided by p x r x 10.

As far as wine is concerned: It would depend on whether you are referring to fortified wine or not. (Fortified implying that alcohol had been added to the wine)

Usually, on any bottle, the % of alcohol is indicated. 10% would imply 10 grams/alcohol per 100 ml of wine. Then once again the Widmark formulae can be applied to get an estimation of expected blood alcohol level.

Many other factors determine the uptake of alcohol.

These factors include:

Volume, strength, type of dilutant ( eg Coke), type of meal, medication, previous operations, temp of drink, the water content of organs, diffusion gradient, the rate of blood flow, any GIT disease etc. The effects vary from person to person. No set pattern of behaviour does exist. We do not wish to elaborate on all these factors. As you can probably deduct, there is not a simple answer to the question !!

It is important to understand that alcohol affects the cognitive functions of the intoxicated person. Driving is an action that requires good multitasking with the driver having to concentrate not only on steering the vehicle- but also road conditions, other vehicles and pedestrians, signs and traffic lights etc

Visitors to the Arrive Alive website often ask how many drinks they may have before they go on the road. This is a question we need to approach with caution. It is important to recognize that there are too many variables to provide an exact answer - and we can only provide a rough guide.

It is also important to recognize that this is only a guide to what might keep you within the legal limit.

Affects of alcohol

If the question is “How many drinks may I have before my ability to drive is reduced?” - the answer would be NONE!

 

We would rather like to recommend that you DO NOT drink before you drive and that you plan ahead and have a sober designated driver take you home!

We would like to share the guide provided by the Institute of Alcohol Studies:

The basic guideline in South Africa is that 2 drinks within 1 hour will put you on/over the legal limit so don’t drink more than this if you will be driving.

View: Alcohol and You - Institute of Alcohol Studies

Alcohol can also contribute to inattentional blindness - the failure to detect unexpected salient objects that appear in the visual field of the intoxicated person.

Click Here for the International Study: Blind Drunk: The Effects of Alcohol on Inattentional Blindness

A study by Seema L Clifasefi, Melanie K T Takarangi & Jonah S Bergman

To conclude - do not drink and drive!

View this Guide from South Africans Against Drunk Driving [SADD]

Also, visit the following sections:

Drunk Driving and Road Safety

Alcohol, Drugs and Road Safety

Loading...

Search Road Safety Articles

Latest Pages

Spark Plugs and Safety on the Road

Spark Plugs and Safety on the Road

Introduction: Most motorists have at some stage seen spark plugs in vehicles – but apart from the obvious “spark”, they need to provide few are aware of exactly how it works and why it is important for safety on the road. Spark plugs have a central role in the car functioning

Read More

Health Precautions and Safe Travel

Health Precautions and Safe Travel

Health Precautions and Safe Travel The Coronavirus/ COVID-19 pandemic has revealed that we are a very connected world, difficult to isolate and easy to have germs, infections and illnesses transmitted to fellow travellers. We are vastly unprepared to fight contagion and need to be better prepared

Read More

Buying Quality Auto Parts and Safety on the Road

Buying Quality Auto Parts and Safety on the Road

On the Arrive Alive website, we emphasize the importance of vehicle roadworthiness and maintenance. The auto parts industry plays a significant role in enabling vehicle owners and mechanics to keep vehicles in roadworthy condition! But what are the risks, pitfalls and the advice we need to know when

Read More

Travel insurance and safety for travellers

Travel insurance and safety for travellers

Introduction and Description Can you depart on your vacation with the confidence that you have secured the best assistance and medical attention in the event of an emergency during your travels? Travel insurance is an essential but often overlooked item in the checklist before going on vacation. We

Read More

The Emergency Medical Kit and Safety on the Road

The Emergency Medical Kit and Safety on the Road

The Emergency Medical Kit and Safety on the Road We should always do our best to be prepared to respond to any emergency. Even though we may not be trained medical professionals there are often small bits of assistance we can provide with first aid and effective and fast response to smaller emergencies. We

Read More

Medicine / Medication and Road Safety

Medicine / Medication and Road Safety

Medication and the Effect Thereof One of the greatest sciences today is that of medicine and it doesn’t matter what season of the year, the body might need it to help cure the cause and symptoms of illness. During the winter months a lot of us head of to our pharmacist in order to buy medication

Read More

Load More Pages

Partners

View All