Image of a School Sign (S1-1) SCHOOL SIGN (S1-1)
The School Sign (S1-1) shall be authorized for use on a street or highway adjacent to school buildings or grounds and from which children have direct access to the school.  An S1-1 sign may be supplemented with a School Panel (S4-3P).

The S1-1 sign may be placed at a marked school crosswalk.  If used, the School Crossing assembly shall installed at the school crossing, or as close to it as possible, and shall consist of an S1-1 sign supplemented with a Diagonal Downward Pointing Arrow Plaque (W16-7P) to show the location of the crossing.  A School Advance Crossing assembly shall be used in advance the first School Crossing assembly that is encountered in each direction as traffic approaches a school crosswalk and shall consist of an S1-1 sign supplemented with an Ahead Plaque (W16-9P) or an XX Feet Plaque (W16-2P).  The School Advance Crossing assembly may be omitted where an S1-1 sign is installed to identify the beginning of a school zone in advance of the School Crossing assembly.

The 30 inches x 30 inches size is for use in urban areas and the 36 inches x 36 inches size is for use in rural areas.  The 48 inches x 48 inches size should be used on roadways that have four or more lanes with posted speed limits of 40 MPH or higher.
Image of a School Bus Stop Ahead Sign (S3-1) SCHOOL BUS STOP AHEAD SIGN (S3-1)
(a) Justification.  The School Bus Stop Ahead Sign (S3-1) shall be authorized for use in advance of locations where a school bus, when stopped to pick up or discharge passengers, is not visible by a motorist for a distance of 500 feet in advance.

(b) Placement.  The S3-1 sign should normally be placed 500 feet in advance of the school bus stop.

(c) Size.  The standard size is 30 inches x 30 inches.  The 48 inches x 48 inches size should be used on roadways that have four or more lanes with posted speed limits of 40 MPH or higher.
Image of a School Bus Turn Ahead Sign (S3-2) SCHOOL BUS TURN AHEAD SIGN (S3-2)
(a) Justification.  The School Bus Turn Ahead Sign (S3-2) shall be authorized for use in advance of locations where a school bus turns around by backing onto one of the roads at an intersection.

(b) Placement.  The S3-2 sign may be installed on any approach to the intersection.

(c) Size.  The 48 inches x 48 inches size should be used on roadways that have four or more lanes with posted limits of 40 MPH or higher.
Image of a School Bus Crossing Sign (S3-3) SCHOOL BUS CROSSING SIGN (S3-3)
(a) Justification.  The School Bus Crossing Sign (S3-3) may be used in a advance of a school bus crossing where traffic conditions such as approach speeds, visibility and conflicts are such that special warning is desired.

(b) Size.  The 48 inches x 48 inches S3-3 sign should be used on roadways that have four or more lanes with posted speed limits of 40 MPH or higher.
Image of a School Panel (S4-3P)
 SCHOOL PANEL (S4-3P)
(a) Justification.  The School Panel (S4-3P) shall be used in conjunction with the Speed Limit Sign (R2-1) in accordance with Department of Transportation regulations.  The S4-3P panel shall be mounted directly above the R2-1 sign.  The School Panel (S4-3P) may be used to supplement the School Sign (S1-1).  When used with the S1-1 sign, the S4-3P panel shall be mounted below the S1-1 sign.

(b) Size.  The 36 inches x 12 inches size should be used on roadways that have four or more lanes with posted speed limits of 40 MPH or higher.
Image of a When Flashing Sign (S4-4P)
 WHEN FLASHING SIGN (S4-4P)
(a) Justification.  The When Flashing Sign (S4-4P) shall be authorized for use in lieu of the School Sign (S1-1) when engineering data justifies the need to display the 15 MPH speed limit provided in Section 3365(b) of the Vehicle Code (75 P.S. Section 3365(b)).  This sign shall be used in conjunction with the School Panel (S4-3P), the Speed Limit Sign (R2-1) and the Speed Limit Sign Beacon in accordance with Department of Transportation regulations (relating to speed limit sign beacon) to indicate that all vehicles are restricted to a maximum of 15 MPH speed limit during the time the beacons are flashing.

The S4-4P sign shall be mounted directly below the Speed Limit Sign (R2-1).

(b) Permit.  Local authorities shall secure a permit for use of this sign in conjunction with the Speed Limit Sign Beacon in accordance with Department of Transportation regulations (relating to authorization of use).

(c) Placement.  The S4-4P sign shall be placed not less than 150 feet in advance of the access point to the School building.  The Speed Limit Sign Beacon shall be placed in accordance with Department of Transportation regulations (relating to speed limit sign beacon).

(d) Size.  The 36 inches x 18 inches size should be used on roadways that have four or more lanes with posted speed limits of 40 MPH or higher.
Image of a Reduced Speed (School) Zone Ahead Sign (S4-5) REDUCED SPEED (SCHOOL) ZONE AHEAD SIGN (S4-5)
(a) Justification.  A Reduced Speed (School) Zone Ahead Sign (S4-5) should be used to inform road users of a reduced speed zone where the limit is being reduced by more than 10 MPH, or where engineering judgment indicates that advance notice would be appropriate.

(b) Size.  The 48 inches x 48 inches size should be used on roadways that have four or more lanes with posted limits of 40 MPH or higher.
Image of a End School Zone Sign (S5-2)
 END SCHOOL ZONE SIGN (S5-2)
(a) Justification.  The End School Zone Sign (S5-2) shall be authorized for use at the end of a school zone which is indicated by the School Sign (S1-1), the School Panel (S4-3P), or Variable School Speed Limit Sign in accordance with Department of Transportation regulations.

(b) Size.  The 36 inches x 48 inches size should used on roadways that have four or more lanes with posted speed limits of 40 MPH or higher.