Diverging diamond interchange — South Dakota Permit Test

Diverging diamond interchange on the South Dakota permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.

The rules

In a diverging diamond interchange, all left turns onto the freeway are free flow, meaning vehicles do not stop to get onto the ramp.

A driver who stops at the left-turn ramp expecting a light gets hit by the car behind that does not.

All left turns onto the freeway are free flow, meaning vehicles do not stop to access the ramp.
South Dakota Driver License Manual, p.42

In a diverging diamond interchange, drivers follow the signs, signals and markings through the first set of signals, where traffic appears as if on a one-way street.

Drivers surprised to be on the left side of the road may swerve back if they do not trust the markings.

Drivers follow the signs, signals, and pavement markings to cross through the intersection at the first set of traffic signals.
South Dakota Driver License Manual, p.42

In a diverging diamond interchange, vehicles going straight simply proceed through a second set of traffic signals.

A driver who thinks the first light was the last one may roll through the second red light.

Vehicles going straight simply proceed through a second set of traffic signals.
South Dakota Driver License Manual, p.42

In a diverging diamond interchange, pedestrians use designated walkways and cross only at the crosswalks, while bicyclists may use the bike lane or the walkways and crosswalks.

Drivers watching only crosswalks will miss a bicyclist riding in the bike lane beside them.

Bicyclists may choose to use the bike lane or pedestrian walkways and crosswalks.
South Dakota Driver License Manual, p.42

On the test

In a diverging diamond interchange, how do left turns onto the freeway work?

They are free flow, with no stop. A driver who stops at the left-turn ramp expecting a light gets hit by the car behind that does not. South Dakota Driver License Manual, p.42: “All left turns onto the freeway are free flow, meaning vehicles do not stop to access the ramp.”

How this works

Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.

You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.

Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.

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Where these come from

Every rule here is checked against South Dakota Driver License Manual, published by the South Dakota Department of Public Safety, and against the state code itself. Last checked 2026-10-04.