File:PA-378.svgDescriptionPA-378.svg 750 mm by 600 mm (30 in by 24 in) Pennsylvania shield, made to the specifications of the Manual on Uniform Traffic Control Devices
File:PA-378 (1926).svgDescriptionPA-378 (1926).svg English: 1926 version of the Pennsylvania Route 378 state highway marker Date 3 February 2011, 05:09 (UTC) Source File:PA-XX (1926)
File:PA-378 (1948).svgDescriptionPA-378 (1948).svg Pennsylvania route marker from 1948 Date 13 March 2016, 07:20 (UTC) Source File:PA-XX_(1948).svg Author Template: User:Fredddie
File:PA-378 (1960).svgDescriptionPA-378 (1960).svg Pennsylvania route marker from 1960 Date 21 August 2015 Source Approximated from this photo Author Dough4872
File:I-378 (PA 1961).svgDescriptionI-378 (PA 1961).svg English: 750 mm by 600 mm (30 in by 24 in) Interstate shield (metric version), made to the specifications of the 2004 edition