Applying Clustered KNN Algorithm for Short-Term Travel Speed Prediction and Reduced Speed Detection on Urban Arterial Road Work Zones

Table 5

Prediction reliability based on mean absolute percentage error (MAPE).

MAPE	Prediction reliability
0% ≤ MAPE < 10%	Very accurate prediction
10% ≤ MAPE < 20%	Accurate prediction
20% ≤ MAPE < 50%	Reasonable prediction
50% > MAPE	Not accurate prediction