Marijuana illegal drugs mixing — Rhode Island Permit Test

Marijuana illegal drugs mixing on the Rhode Island permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.

The rules

Marijuana reduces reaction time, alters attention to the road and increases lane weaving.

A driver high on marijuana drifts out of his lane and reacts late to a stopped car.

Studies have shown that marijuana can have a negative effect on drivers through reduced reaction time, altered attention to the road, and increased lane weaving.

Rhode Island Driver’s Manual, p.60

Drivers under the influence of marijuana take longer to adjust their eyes to headlight glare.

A driver blinded longer by oncoming headlights cannot see a person in the road.

Drivers under the influence of marijuana also have longer visual adjustments to headlight glare.

Rhode Island Driver’s Manual, p.60

Illegal drugs such as LSD, cocaine and heroin make users unaware of or indifferent to their surroundings and unable to drive safely.

A driver who does not care what is around him will not notice the child stepping off the curb.

They make users unaware or indifferent to their surroundings and unable to drive a motor vehicle safely.

Rhode Island Driver’s Manual, p.60

Combining alcohol with another drug can cause a synergistic effect, in which the effects are multiplied.

A driver who thinks one drink and one pill add up to little is far more impaired than he feels.

Combining alcohol with another drug can cause a synergistic effect, whereby the effects are multiplied.

Rhode Island Driver’s Manual, p.60

One drink taken with another drug, even a simple allergy or cold remedy, can affect driving like several alcoholic drinks.

A driver on cold medicine who has one beer can be as impaired as if he had several.

One drink taken when you are also taking another drug, even a simple allergy or cold remedy, could have the same effect on your driving ability as having several alcoholic beverages.

Rhode Island Driver’s Manual, p.60

On the test

Which effect of marijuana on drivers does the manual name?

Increased lane weaving. A driver high on marijuana drifts out of his lane and reacts late to a stopped car. Rhode Island Driver’s Manual, p.60: “Studies have shown that marijuana can have a negative effect on drivers through reduced reaction time, altered attention to the road, and increased lane weaving.”

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Where these come from

Every rule here is checked against Rhode Island Driver’s Manual, published by the Rhode Island Division of Motor Vehicles, and against the state code itself. Last checked 2026-10-04.