30 November 1998
(j) Consider the requirements for snow removal.
(2) Islands and Medians. Locate islands at the ends of parking stalls and at the
intersections of parking aisles. The islands establish turning radii for vehicular movement and
protect end stalls. Turning radii to be used is based upon the largest vehicle that will utilize the
parking lot. Include turning radii that is sufficient to allow safe traffic movement without
conflicting with the island and/or curbing. Figure 2-5 illustrates considerations for designing
islands and medians. Consider the 1.3m (52-in.) motorist eye level viewing height when
providing shrubs and small trees. The purpose of placing plant material in islands and/or
medians in the midst of parking lots it to:
(a) Provide separation by vehicle and function.
(b) Break up the expanse of impermeable and unshaded surface.
(c) Provide a more pleasing visual and spatial appearance.
(d) Preserve existing vegetation.
(e) Consider the requirements for snow removal.
(3) Landscape Plant Material. TM 5-803-13 provides guidance for the selection and
placement of plant material. The planted area within and around a parking lot is usually based
on a proportional amount of "green" space to paved area. Typically, a minimum of ten (10%)
percent of the area is utilized for landscape plant material. Table 2-5 and figure 2-5 provides
guidance concerning space or clearance within islands and medians to accommodate plant
material and light poles. The minimum distance for pavement from existing trees is 1.2m (4 ft) or
half (1/2) the distance from the tree trunk to the outer edge of the tree dripline, whichever is
greater. Figure 2-6 illustrates the use of landscape plant material within a parking lot.
Table 2-5. Parking Island Widths
Minimum 1.5m (5 ft)
Grasses, Groundcovers, and Small Shrubs
Minimum 2.2m (8 ft)
Light Standards and new Medium Trees and
Minimum 3m (10 ft)
New Large Trees and Shrubs
(4) Pedestrian Use. Islands and medians can be partially or completely paved to service
pedestrian traffic. Pedestrians tend to use circulation aisles, especially if medians are not
generous and do not allow for comfortable movement between vehicles. If the median is
designed as a sidewalk, provide a width that allows for pedestrian movement and vehicle