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Article 11: Interpretation and Definitions
Section 11.5. Terms and Uses Defined
11.4.2. Exceptions and Variations
Morrisville, NC
June 23, 2017
Unified Development Ordinance
Page 11-47
L
EADERSHIP IN
E
NERGY AND
E
NVIRONMENTAL
D
ESIGN
(LEED)
Verification by the U.S. Green Building Council of a building or development that is designed and
constructed using strategies aimed at improving environmental performance including, but not limited to,
energy savings, water efficiency, C02 emissions reduction, and indoor environmental quality in the form
of LEED certification.
L
EVEL OF
S
ERVICE
(LOS)
A scale that measures the amount of traffic that a roadway or intersection can accommodate, based on
such factors as maneuverability, driver dissatisfaction, and delay. The following describe levels of
service:
LOS A
indicates a relatively free flow of traffic, with little or no limitation on vehicle movement or
speed.
LOS B
describes a steady flow of traffic, with only slight delays in vehicle movement and speed.
All queues clear in a single signal cycle.
LOS C
denotes a reasonably steady, high-volume flow of traffic, with some limitations on
movement and speed, and occasional backups on critical approaches.
LOS D
designates the level where traffic nears an unstable flow. Intersections still function, but
short queues develop and cars may have to wait through one cycle during short peaks.
LOS E
represents traffic characterized by slow movement and frequent (although momentary)
stoppages. This type of congestion is considered severe, but is not uncommon at peak traffic hours,
with frequent stopping, longstanding queues, and blocked intersections.
LOS F
represents an unacceptable, forced or breakdown flow, representing jammed conditions.
The amount of traffic approaching an intersection cannot be accommodated adequately.
L
EVEL OF
S
ERVICE
, P
RE
-
DEVELOPMENT
Existing traffic plus background development traffic, but not including the proposed development traffic.
L
IGHT
E
MITTING
D
IODE
(LED)
An electronic semiconductor device that emits light when an electric current passes through it. They are
considerably more efficient than incandescent bulbs, and rarely burn out. LEDs are used in many
applications such as flat-screen video displays, and increasingly as general sources of light.
L
IGHT
S
OURCE
The element of a lighting fixture that is the point of origin of the lumens emitted by the fixture.
L
IGHT
T
RESPASS
The occurrence when light emitted by a lighting installation falls outside the boundaries of the property
on which the installation is sited. This can have adverse effects on residents, vehicle operators and
pedestrians, the natural environment.
L
IMITED
-A
CCESS
H
IGHWAY
Thoroughfares so designated on the Morrisville Thoroughfare Plan where access is by at-grade
thoroughfares and driveway cuts onto the limited-access road are prohibited.
L
IMITED
F
UEL
/O
IL
/B
OTTLED
G
AS
D
ISTRIBUTION
The distribution of fuel oil or bottled gases, such as propone or liquid petroleum, in cans with volumes no
greater than five gallons, for compensation.