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=={{SpanID|903.3.4}}903.3.4 Placement of Warning Signs (MUTCD Section 2C.04)== '''Support.''' Information on the placement of warning signs is contained in EPG 903.1.13 through 903.1.18. The time needed for detection, reco..."

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=={{SpanID|903.3.4}}903.3.4 Placement of Warning Signs (MUTCD Section 2C.04)==
'''Support.''' Information on the placement of warning signs is contained in [[903.1 General (MUTCD Chapter 2A) #903.1.13|EPG 903.1.13]] through [[903.1 General (MUTCD Chapter 2A) #903.1.18|903.1.18]].

The time needed for detection, recognition, decision, and reaction is called the Perception-Response Time (PRT). [[#tab903.3.4|Table 903.3.4]] is provided as an aid for determining warning sign location. The distances shown in [[#tab903.3.4|Table 903.3.4]] can be adjusted for roadway features, other signing, and to improve visibility.

'''Guidance. '''Warning signs should be placed so that they provide an adequate PRT. The distances contained in [[#tab903.3.4|Table 903.3.4]] should be applied with engineering judgment.

Minimum spacing between warning signs with different messages should be based on the estimated PRT for driver comprehension of and reaction to the second sign.

The effectiveness of the placement of warning signs should be periodically evaluated. This is typically accomplished during routine sign inspection cycles. [[903.1 General (MUTCD Chapter 2A) #903.1.19|EPG 903.1.19]] contains information regarding MoDOT’s sign maintenance program.

'''Standard. '''When any part of a warning sign assembly (post, sign, plaque, etc.) is replaced, maintained or modified, the placement of the sign should be reviewed based on advance placement distances in [[#tab903.3.4|Table 903.3.4]]. Additionally, mounting height should be reviewed for conformance with [[903.1 General (MUTCD Chapter 2A) #903.1.15|EPG 903.1.15]].

{{SpanID|tab903.3.4}}
{| class="wikitable"
|-
|+ '''Table 903.3.4''' Guidelines for Advance Placement of Warning Signs
|- style="text-align:center;"
! rowspan="3" | Posted or 85th-Percentile Speed
! colspan="9" | Advance Placement Distance1
|- style="text-align:center;"
! rowspan="2" style="max-width: 200px;" | Condition A: Speed reduction and lane changing in heavy traffic2
! colspan="8" | Condition B: Deceleration to the listed advisory (mph) for the condition
|- style="text-align:center;"
! 03
! 104
! 204
! 304
! 404
! 504
! 604
! 704
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 20 mph
| style="vertical-align:middle;" | 225 ft
| style="vertical-align:middle;" | 115 ft
| N/A5
| —
| —
| —
| —
| —
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 25 mph
| style="vertical-align:middle;" | 325 ft
| style="vertical-align:middle;" | 155 ft
| N/A5
| N/A5
| —
| —
| —
| —
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 30 mph
| style="vertical-align:middle;" | 460 ft
| style="vertical-align:middle;" | 200 ft
| N/A5
| N/A5
| —
| —
| —
| —
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 35 mph
| style="vertical-align:middle;" | 565 ft
| style="vertical-align:middle;" | 250 ft
| N/A5
| N/A5
| N/A5
| —
| —
| —
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 40 mph
| style="vertical-align:middle;" | 670 ft
| style="vertical-align:middle;" | 305 ft
| 100 ft6
| 100 ft6
| N/A5
| —
| —
| —
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 45 mph
| style="vertical-align:middle;" | 775 ft
| style="vertical-align:middle;" | 360 ft
| 125 ft
| 100 ft6
| 100 ft6
| N/A5
| —
| —
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 50 mph
| style="vertical-align:middle;" | 885 ft
| style="vertical-align:middle;" | 425 ft
| 200 ft
| 175 ft
| 125 ft
| 100 ft6
| —
| —
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 55 mph
| style="vertical-align:middle;" | 990 ft
| style="vertical-align:middle;" | 495 ft
| 275 ft
| 225 ft
| 200 ft
| 125 ft
| N/A5
| —
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 60 mph
| style="vertical-align:middle;" | 1100 ft
| style="vertical-align:middle;" | 570 ft
| 350 ft
| 325 ft
| 275 ft
| 200 ft
| 100 ft6
| —
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 65 mph
| style="vertical-align:middle;" | 1200 ft
| style="vertical-align:middle;" | 645 ft
| 450 ft
| 400 ft
| 350 ft
| 275 ft
| 200 ft
| 100 ft6
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 70 mph
| style="vertical-align:middle;" | 1250 ft
| style="vertical-align:middle;" | 730 ft
| 525 ft
| 500 ft
| 450 ft
| 375 ft
| 275 ft
| 150 ft
| —
|- style="vertical-align:middle;"
| style="vertical-align:middle;" | 75 mph
| style="vertical-align:middle;" | 1350 ft
| style="vertical-align:middle;" | 820 ft
| 625 ft
| 600 ft
| 550 ft
| 475 ft
| 375 ft
| 250 ft
| 100 ft6
|-
| style="background-color: #ffffff" colspan="11" |
|-
| style="background-color: #ffffff" colspan="11" | Note 1 — For Advanced Placement Distance — General
* The distances are adjusted for a sign legibility distance of 180 feet for Condition A.
* The distances for Condition B (with the exception of the potential stop condition) have been adjusted for a sign legibility distance of 250 feet, which is appropriate for an alignment warning symbol sign.
* For Conditions A and B, warning signs with less than 6-inch legend or more than four words, a minimum of 100 feet should be added to the advance placement distance to provide adequate legibility of the warning sign.

Note 2 — For Condition A — Speed Reduction and Lane Change Conditions
* Typical conditions are locations where the road user must use extra time to adjust speed and change lanes in heavy traffic because of a complex driving situation or reduce to a new posted speed.
* Typical signs are Merge, Right Lane Ends, and Reduced Speed Ahead.
* The distances are determined by providing the driver a PRT of 14.0 to 14.5 seconds for vehicle maneuvers (2018 AASHTO Policy, Table 3-3, Decision Sight Distance, Avoidance Maneuver E) and adjusted for a legibility distance of 180 feet for the appropriate sign.

Note 3 — For Condition B — Stop Condition
* Typical condition is the warning of a potential stop situation.
* Typical signs are Stop Ahead, Yield Ahead, Signal Ahead, and Intersection Warning signs.
* The distances are based on the 2018 AASHTO Policy, Table 3-1, Stopping Sight Distance, providing a PRT of 2.5 seconds, a deceleration rate of 11.2 feet/second2.

Note 4 — For Condition B — Reduced Speed Conditions
* Typical conditions are locations where the road user must decrease speed to maneuver through the warned condition.
* Typical signs are Turn, Curve, Reverse Turn, Reverse Curve, or Reduced Speed Ahead.
* The distance is determined by providing a 2.5 second PRT, a vehicle deceleration rate of 10 feet/second2, and adjusted for a sign legibility distance of 250 feet.

Note 5 — For Condition B — N/A Values
* No suggested distances are provided for these speeds, as the placement location is dependent on site conditions and other signing.
* An alignment warning sign may be placed anywhere from the point of curvature up to 100 feet in advance of the curve.
* However, the alignment warning sign should be installed in advance of the curve and at least 100 feet from any other signs.

Note 6 — For Condition B — for shortest distance values per posted speed
* The minimum advance placement distance is listed as 100 feet to provide adequate spacing between signs.

General Note:

Warning signs that advise road users about conditions that are not related to a specific location can be installed in an appropriate location, based on engineering judgment.
|}

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Hoskir: Created page with "'''copy all of 903.3.4''' =={{SpanID|903.3.4}}903.3.4 Placement of Warning Signs (MUTCD Section 2C.04)== '''Support.''' Information on the placement of warning signs is contained in EPG 903.1.13 through 903.1.18. The time needed for detection, reco..."

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'''copy all of 903.3.4'''

=={{SpanID|903.3.4}}903.3.4 Placement of Warning Signs (MUTCD Section 2C.04)== '''Support.''' Information on the placement of warning signs is contained in EPG 903.1.13 through 903.1.18. The time needed for detection, reco..."