M22-01. 20 Design Manual

(5)(c) Single-Lane Off-Connections

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1360.04(5)(c) Single-Lane Off-Connections
For single-lane off-connections, the tapered is desirable. Use the design shown in Exhibit 1360-19 for tapered
single-lane off-connections. Justify the use of a parallel single-lane off-connection, as shown in Exhibit 1360-20.
1360.04(5)(d) Single-Lane Off-Connection With One Lane Reduction
The single-lane off-connection with one lane reduction, shown in Exhibit 1360-21, is used when the conditions
from lane balance for a single-lane exit, one-lane reduction, are met.
1360.04(5)(e) Tapered Two-Lane Off-Connection
The tapered two-lane off-connection design, shown in Exhibit 1360-22, is desirable where the number of
freeway lanes is reduced or where high-volume traffic operations will be improved by the provision of a parallel
auxiliary lane and the number of freeway lanes is unchanged.
1360.04(5)(f) Parallel Two-Lane Off-Connection
The parallel two-lane off-connection, shown in Exhibit 1360-23, allows less operational flexibility than the taper,
requiring more lane changes. Justify the use of a parallel two-lane off-connection.

Chapter 1360
Interchanges
WSDOT Design Manual M 22-01.20
Page 1360-18
September 2021
Exhibit 1360-12 Gore Area Characteristics
Notes:
[1] The reserve area length (L) is not less than:
Main Line Design Speed (mph)
40
45
50
55
60
65
70
80
L (ft)
25
30
35
40
45
50
55
70
[2] 𝑍 =
𝐷𝑒𝑠𝑖𝑔𝑛 𝑆𝑝𝑒𝑒𝑑
2
, design speed is for the main line.
[3] Radius may be reduced, when protected by an impact attenuator.

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