सड़क के केंद्र में अनुदैर्ध्य (longitudinally) रूप से खींची गई एक ठोस सफेद रेखा आमतौर पर क्या दर्शाती है?

In mandatory road traffic signs, what does a blue circular sign with a white arrow pointing upward indicate?

Match Column-I (Category of Sign) with Column-II (Shape/Design of Sign): Column-I: (a) Mandatory Sign (b) Informatory Sign (c) Cautionary Sign Column-II: (I) Rectangle with blue background/border (II) Triangle with red border (III) Circle with red border