Interstate vs. Highway: What's the Difference?

When preparing for a road trip, it’s essential to familiarize yourself with the various road types you’ll come across. “Interstate” and “highway” are two frequently used terms that are often confused for being the same. However, there are significant differences between the two that could affect your travel arrangements. Within these pages, we’ll delve into the dissimilarities between interstates and highways to help you plan your next road trip confidently.

Table of Contents

Interstate vs. Highway: The Basics

What Is a Highway?

A highway is a general term for a public road. Highways can be small or large, and they often connect cities, towns, and states. You can think of a highway as any major road used for long-distance travel.

Types of Highways

There are different types of highways:

Local highways – These connect towns and smaller cities.
State highways – These are managed by each U.S. state. For example: Texas State Highway 6.
U.S. highways – These are part of the national road system but are not interstates. For example: U.S. Highway 66 (Route 66).
Interstate highways – These are a special type of highway. We will talk more about them in the next section.

So, a highway can include many different road systems, including interstates!

What Is an Interstate?

An interstate is a specific kind of highway in the United States. It is part of the Interstate Highway System, which began in the 1950s.

The interstate system was designed to:

Connect all 50 U.S. states
Allow fast and safe travel
Support military and emergency transportation

Features of an Interstate:

No stop signs or traffic lights
Multiple lanes in both directions
Controlled access – cars enter and exit using ramps
Maintained by the federal government
Interstate names start with “I-”, like I-95, I-10, or I-80

Interstate vs. Highway: Key Differences

Feature	Highway	Interstate
Definition	A public road for travel	A special highway system in the U.S.
Managed by	State or local government	Federal government
Starts with	May be “US-” or state names	Always “I-” (e.g., I-75)
Traffic control	May have lights or stop signs	No stop signs or lights
Access	Can have driveways or intersections	Access only via ramps
Speed	Slower in some areas	Usually faster (65–75 mph)
Purpose	General road travel	Fast travel between states

Useful Phrases: Interstate & Highway

Phrase	Example Sentence
Get on the interstate	Let’s get on the interstate to reach the next city faster.
Take the highway	We can take the highway to the beach.
Exit ramp	The next exit ramp is for downtown.
Merge onto	Merge onto I-95 heading north.
Speed limit	The speed limit on this highway is 70 mph.
Pull over	The police asked me to pull over on the side of the highway.
Traffic jam	We got stuck in a traffic jam on the interstate.
Road trip	We’re going on a road trip across several states using the interstate.
Rest area	Let’s stop at the next rest area to use the restroom.
Road sign	That road sign shows the way to the interstate.
Detour	There’s a detour because of construction on the highway.
Construction zone	Drive slowly through the construction zone.
Highway patrol	The highway patrol was checking cars for speeding.
Change lanes	You need to change lanes before the exit.
Stay in your lane	Stay in your lane while driving on the interstate.
Follow the signs	Just follow the signs to get back on the interstate.
Miss the exit	I missed the exit and had to turn around.
Fast lane	He was driving fast in the fast lane.
Slow lane	Trucks usually stay in the slow lane.
Heavy traffic	There’s heavy traffic on the highway this morning.
Turnpike	We have to pay a toll to use the turnpike.
Toll road	This is a toll road, so we need to pay at the booth.
Service station	There’s a service station coming up on the right.
Get off at the next exit	Get off at the next exit for the shopping mall.
Drive safely	Always drive safely, especially on the interstate.

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