4.1 Regulatory Signs

4.1 Regulatory Signs

Quick Answer: Traffic regulation signs regulate traffic speed as well as movement and display rules which drivers must obey. Read color and shape first, then the legend. Stop is the eight-sided red sign; Yield is the red equilateral triangle. Plaques CROSS TRAFFIC DOES NOT STOP and ALL WAY can be added under a stop sign. Do Not Enter and Wrong Way mean you are pointed against legal traffic. No Turn on Red, No Left Turn, No Right Turn, and No U-Turn prohibit those moves. Speed Zone Ahead only warns that a numbered SPEED LIMIT is coming; Minimum Speed sets a floor.

The Indiana knowledge exam's traffic-signs component is drawn from Chapter 6 of the Driver's Manual. Chapter 3 taught you to classify a panel by color and shape. This section loads the regulatory gallery: the white and red commands that tell you what you must, must not, or must be ready to do. A warning diamond prepares you. A regulatory sign governs you. Treating a white SPEED LIMIT like a yellow advisory, or rolling an octagon because the street looks empty, is how drivers fail both the signs component and a real intersection.

What a regulation sign is

The manual's heading is Traffic Regulation Signs. The definition is one sentence: they regulate traffic speed as well as movement and display rules which drivers must obey.

Two jobs, always mandatory:

1. Speed — numbered limits, a minimum speed, and advance notice that a speed zone is coming.
2. Movement — stop, yield, turn bans, required turns, lane use, passing, parking, and “do not enter this path.”

Color usually matches Chapter 3: red for immediate-action safety regulations (Stop, Yield, Do Not Enter, Wrong Way); white for speed limits, No Turn on Red, and similar rules you must obey. Do not re-litigate color here. Use it to confirm you are reading a command, not a green distance sign or a brown park sign.

Stop, yield, and the plaques under the octagon

Stop is the eight-sided sign. You must stop and yield the appropriate right of way at the intersection. A complete stop means the vehicle is no longer rolling before you look and proceed. Right-of-way order (who goes first at an all-way stop) is a later maneuvers chapter. The signs skill is: octagon = stop is required.

Yield is the equilateral-triangle regulation. Slow down approaching the intersection and be prepared to come to a complete stop in order to yield to other drivers or pedestrians. Yield is not a rolling suggestion if someone is already in the conflict area. It is also not an octagon. Mixing those two shapes is one of the highest-value traps on the signs component.

Supplemental plaques are sometimes added to the bottom of stop signs to indicate directions in which the intersection must stop. Chapter 6 prints two:

If there is no plaque, do not invent ALL WAY. Look left, right, and ahead for vehicles that never had a stop sign.

Stop Here on Red is a separate regulation, often at a signal, telling you the location of the stop for a red indication—typically at the stop line, not in the crosswalk or in the intersection. Do Not Block Intersection forbids sitting in the box even if your light was green when you entered the queue. Both are movement rules, not yield triangles.

Wrong way, one way, keep right, and passing

These signs keep you out of the opposing stream:

• Do Not Enter — the opening (ramp, driveway, one-way street) is not an entrance for you.
• Wrong Way — you are already traveling against the legal direction. Immediate action: get out of the conflicting path as soon as you can do it without causing a crash.
• One Way — lawful travel is only in the pointed direction. Indiana's gallery shows more than one One Way layout; the message is the same.
• Keep Right — stay to the right of an island, median, or obstruction.
• Do Not Pass — you may not pass here (pair it with the left-side yellow pennant from Chapter 3 and with solid yellow markings later).
• Slower Traffic Keep Right — if you are the slower vehicle, use the right lane so others can pass on a multi-lane road.

Do Not Enter and Wrong Way often appear together on an interstate ramp. Do Not Enter is the gate. Wrong Way is the last red warning that you are pointed at oncoming traffic. Neither is a “when convenient” suggestion.

Speed regulations versus later advisory plates

Chapter 6's regulation list includes Minimum Speed and Speed Zone Ahead. Connect them to what you already know from warning signs:

• A white SPEED LIMIT (the regulation rectangle from Chapter 3) is the numbered limit you must obey unless a special zone or condition law says otherwise.
• Speed Zone Ahead is an advance regulation: a posted speed zone is coming. It does not replace the numbered limit, and it is not a yellow 35 M.P.H. exit advisory.
• Minimum Speed (the manual example shows 40) sets a floor on that roadway when conditions allow travel at that speed. Crawling in the left lane at 25 when the minimum is 40 is a regulation problem, not a style choice.
• A yellow rectangular advisory at an exit, ramp, or roundabout is still a warning companion, not this white family.

Worksite Speed Limit is an orange work-zone regulation taught in the next section. Do not call it Speed Zone Ahead.

Turn bans and required lane movements

Indiana's regulation examples are specific. Learn the name and the duty:

Prohibited turns

• No Left Turn / No Right Turn — that turn is banned at the location.
• No U-Turn — a U-turn is banned (later chapters add that U-turns are not a tool for correcting an interstate mistake).
• No Turn on Red — even after a full stop, you may not turn on red here. The white example in Chapter 3 was this sign; this section is the duty.

Required or limited movements

• Left Lane Must Turn Left / Right Lane Must Turn Right / Right Lane Only — if you are in that lane, the named movement is mandatory. Get out of the lane before the sign if you needed to go through.
• Left on Green Arrow Only — a left is allowed only on the green arrow, not on a circular green.
• Left Turn Signal — left turns are controlled by their own signal face; do not treat the through-green as your turn permission.
• Left Turn Yield on Green — a circular green lets you turn left after yielding to oncoming traffic and pedestrians. It is not a protected green arrow.
• Turn Left or Go Through / Turn Right or Go Through — those two movements are allowed from the lane; the missing third movement is not.
• Two-Way Left Turn — the center lane is for left turns from either direction, not for through travel and not for passing.
• Multiple Turns — more than one vehicle may be turning; expect a dual-turn layout and stay in your own turn path.

Signal meanings (steady green, yellow flashing arrow, turn-on-red steps) have their own later section. Here, if the sign says No Turn on Red or Left on Green Arrow Only, the sign wins over a habit you brought from another intersection.

Parking, stopping, and vehicle restrictions

Chapter 6 also prints parking and access regulations as signs you must obey:

• No Parking / No Parking Any Time — do not park there; “any time” removes the excuse that it is evening or Sunday.
• Limited Parking — parking is allowed only in the posted window (the manual example shows hours such as 8:30 AM TO 5:30 PM).
• Pay Parking — occupancy requires payment.
• Reserved Parking / Reserved Parking Van Accessible — the space is reserved; van-accessible includes the extra striped access aisle. Parking in the striped zone is not “close enough.”
• Tow-Away Zone — a parked vehicle can be towed.
• Emergency Stopping Only — the shoulder or turnout is not general parking.
• No Trucks — trucks are prohibited on that route or in that lane.
• Restricted Lane — that lane is limited to the uses posted on the sign; it is not a general through lane just because it is empty.

Full parking distances (hydrant, crosswalk, yellow curb) are a later parking chapter. For the signs component, read the panel: if it says no parking, reserved, tow-away, or emergency stopping only, that is the rule at that pavement.

flowchart TD
  R[Regulatory sign] --> Q{What family?}
  Q -->|Stop or Yield| SY[Octagon: stop. Triangle: slow, prepared to stop, yield]
  Q -->|Plaque under Stop| P[ALL WAY vs CROSS TRAFFIC DOES NOT STOP]
  Q -->|Do Not Enter / Wrong Way / One Way| D[You are pointed against legal travel — get out of the conflict]
  Q -->|Speed Zone Ahead / Minimum Speed / SPEED LIMIT| SP[Advance zone, floor, or numbered limit — not a yellow advisory]
  Q -->|Turn or lane-use| T[Banned turn, required turn, or two-way left-turn lane]
  Q -->|Parking or restricted lane| PK[Do not park, pay, reserved/van-accessible, tow-away, emergency stop only]

Indiana scenarios

US 40 two-way stop. You stop at the octagon. The plaque is CROSS TRAFFIC DOES NOT STOP. A car on the through street does not have a stop sign. If you pull out because “I already stopped,” you are pulling into moving traffic.

All-way neighborhood intersection. ALL WAY is under the octagon. Everyone stops. You still yield the appropriate right of way after the stop; the plaque did not award you the intersection.

I-65 off-ramp, wrong direction. Do Not Enter faces you at the exit throat. If you missed it, Wrong Way is next. Both are red immediate-action regulations. Do not continue “to the next driveway.”

Left-turn lane downtown. Left Lane Must Turn Left is over your lane, and No Turn on Red is at the signal. You cannot go through from that lane, and you cannot sneak the left on red.

Suburban arterial. Two-Way Left Turn marks the painted center lane. Using it to pass a slow car, or to drive through for two blocks, is a regulation violation, not a clever merge.

Exam traps

• Stop versus yield. Eight sides require a stop. Three equal sides require slowing, prepared to stop, and yielding. Red is not enough to tell them apart.
• ALL WAY versus CROSS TRAFFIC DOES NOT STOP. The first means every approach stops. The second means the other street may not stop. Guessing the wrong plaque is a crash-pattern miss.
• Speed Zone Ahead is not the new number. Wait for the SPEED LIMIT sign. Do not confuse it with a yellow ramp advisory or with Speed Limit Ahead from the warning page.
• Minimum Speed is a floor, not a suggestion to loaf in the left lane.
• Do Not Enter versus Wrong Way. One blocks the entry; the other tells you that you are already wrong-way. Both must be obeyed immediately.
• No Turn on Red overrides a habit of turning after a stop. If the white regulation is posted, the turn on red is banned.
• Left Turn Yield on Green is not a protected arrow. Oncoming traffic still has priority on the circular green.
• Two-Way Left Turn is not a through lane and not a passing lane.
• Reserved Parking Van Accessible includes the striped access aisle. Occupying the stripes blocks a van ramp.

Memorize the Chapter 6 regulation names as duties, not as decoration. The next section adds orange work-zone commands and green, blue, and brown guide signs that look important but are not stop/yield/speed regulations.