Effects of the Installation Angle of Raised Pavement Markers on a Horizontal Curve Section on the Line of Sight Induction Performance

Table 3

Coefficients of luminous intensity and coefficients of retroreflection.

Incident angles (degrees)	Observed angles (degrees)
	0.2			0.33			1			2
	RI; (mcd/lx)	RA; (mcd/lx/cm^2)	Ratios of Improvement (%)	RI; (mcd/lx)	RA; (mcd/lx/cm^2)	Ratios of Improvement (%)	RI; (mcd/lx)	RA; (mcd/lx/cm^2)	Ratios of Improvement (%)	RI; (mcd/lx)	RA; (mcd/lx/cm^2)	Ratios of Improvement (%)
20	1127	62.41	20.03	832	48.23	19.92	121	7.01	15.71	10	0.58	66.67
15	1292	74.89	13.22	997	57.79	13.67	139	8.06	12.35	18	1.04	10.00
10	1462	84.75	8.84	1133	65.69	6.39	157	9.10	6.59	19	1.10	9.09
5	1592	92.29	3.68	1206	69.91	2.29	168	9.74	3.09	20	1.16	0.00
0	1650	95.65		1234	71.54		172	9.97		20	1.16
Average improvement (%)			11.44			10.57			9.44			21.44
Average improvement (%); (Observed angle less than 2 degrees)						10.48						/