| |
Freeways |
Expressways |
Boulevards |
Thoroughfares |
| Functional Purpose |
High Mobility, Low Access |
High Mobility, Low to Moderate Access |
Moderate Mobility, Low to Moderate Access |
Moderate to Low Mobility, High Access |
| AASHTO Design Classification |
Interstate or Freeway |
Arterial |
Arterial or Collector |
Collector or Local |
| Posted Speed Limit |
55 mph or greater |
45 mph to 60 mph |
30 mph to 55 mph |
25mph to 55 mph |
| Control of Access |
Full |
Limited or Partial |
Limited or Partial |
None |
| Traffic Signals |
Not Allowed |
Not Allowed |
Allowed |
Allowed |
| Driveways |
Not Allowed |
Limited Control of Access - Not Allowed
Partial Control of Access - One Driveway
Connection per Parcel; Consolidate and/or Share Driveways and Limit Access to Connecting
Streets or Service Roads; Restrict to Right-in/Right-out
|
Limited Control of Access - Not Allowed
Partial Control of Access - One Driveway Connection per Parcel; Consolidate and/or
Share Driveways and Limit Access to Connecting Streets or Service Roads; Restrict to
Right-in/Right-out
|
Allowed with Full Movements; Consolidate or Share Connections, if possible |
| Cross-Section |
Minimum 4 Lanes with a Median |
Minimum 4 Lanes with a Median |
Minimum 2 Lanes with a Median |
Minimum 2 Lanes; No Median; Includes Facilities with Two Way Left Turn Lane |
| Connections |
Provided only at Interchanges; All Cross Streets are Grade-Separated |
Provided only at Interchanges for Major Cross Streets and At-Grade Intersections
for Minor Cross Streets; Use of Acceleration and Deceleration Lanes for At-Grade
Intersections |
At-Grade Intersections for most Major and Minor Cross Streets (Occasional Interchange
at Major Crossing); Use of Acceleration and Deceleration Lanes |
Primarily At-Grade Intersections |
| Median Crossovers |
Public-use Crossovers Not Allowed; U-turn Median Openings for Use by Authorized
Vehicles Only when Need is Justified |
Allowed; Alternatives to All-Movement Crossovers Encouraged; Minimum Spacing between
All-Movement Crossovers is 2000 feet (posted speed limit of greater than 45 mph) or 1200
feet (posted speed limit of 45 mph or less) |
Allowed; Minimum Spacing between All-Movement Crossovers is 2000 feet (posted speed
limit of greater than 45 mph) or 1200 feet (posted speed limit of 45 mph or less |
Not Applicable |
NCDOT
NCSMARTLINK
NCGOV
