Jointed Plain Concrete Pavements (JPCPs) are considered a sustainable alternative that can resist high traffic demands without regular invasive maintenance interventions that affect the users. But nowadays short slabs are available as a cost-effective non-dowelled JPCP innovation. In this case, the Load Transfer Efficiency (LTE) is caused by aggregate interlock and then it depends on the crack width under the joints. The authors developed a rational-based and detailed model to predict the crack width at joints of traditional JPCPs. However considering the magnitude of the slabs length reduction in the innovative short slabs a correction factor is required. In this way, the objective of the present paper is to determine a correction factor for the modelling of the crack width at joints of JPCPs with short slabs. For that, the equations of the models AASHTO and MEPDG to the simplified calculation of the joint opening at traditional JPCPs are considered. And, in order to explicitly incorporate the JPCPs with short slabs, 2 test sections were built in Chile ceteris paribus with the exception of the slab length. In effect, the slab length of one of the streets is 3.5 m and the other one 50% less, i.e. 1.75 m. A correction factor 0.5 was obtained from the comparison in the field of the crack width at joints of the traditional JPCP with the short slabs JPCP. Hence, the field experience corroborates the correction factor possible to obtain from the simplified equations of AASHTO and MEPDG, but in this case for the innovative short slabs.