1^st Life Cycle Stage	Material Cost				Equipment Cost
	Dependent Variable:		lnma		Dependent Variable:		lneq
	Indep Variable	Estimated Coefficient	Standard Error	t-Statistic	Indep Variable	Estimated Coefficient	Standard Error	t-Statistic
	one	1.77701	0.86607	2.05181	one	2.45308	0.50058	4.90043
	age	0.25317	8.25596e−002	3.06651	lyear	0.88297	0.18148	4.86544
	lyear	1.22293	0.31802	3.84543	elev	6.22756e−004	1.01615e−004	6.12858
	elev	5.75305e−004	1.65039e−004	3.48586
	Number of Observations		159		Number of Observations		159
	Corrected R-squared		0.23406		Corrected R-squared		0.28343
	Mean of Dependent Variable		5.60475		Mean of Dependent Variable		5.70657
2^nd Life Cycle Stage	Material Cost				Equipment Cost
	Dependent Variable:		lnma		Dependent Variable:		lneq
	Indep Variable	Estimated Coefficient	Standard Error	t-Statistic	Indep Variable	Estimated Coefficient	Standard Error	t-Statistic
	one	4.52583	0.18490	24.47656	one	4.29400	0.29732	14.44254
	lyear	2.38705	0.18875	12.64682	age	0.10612	3.07889e−002	−−3.44663
	aadt	5.12930e−003	1.33309e−003	3.84767	lyear	1.04501	0.13215	7.90795
					elev	2.52489e−004	5.38903e−005	4.68523
					aadt	2.04244e−003	8.90404e−004	2.29384
	Number of Observations		446		Number of Observations		448
	Corrected R-squared		0.28976		Corrected R-squared		0.18172
	Mean of Dependent Variable		5.74258		Mean of Dependent Variable		5.70223
3^rd Life Cycle Stage	Material Cost				Equipment Cost
	Dependent Variable:		lnma		Dependent Variable:		lneq
	Indep Variable	Estimated Coefficient	Standard Error	t-Statistic	Indep Variable	Estimated Coefficient	Standard Error	t-Statistic
	one	6.20010	0.14017	44.23313	one	6.31784	0.16710	37.80960
	lyear	0.63605	0.27740	2.29287	lyear	0.78032	0.33069	2.35967
	Number of Observations		94		Number of Observations		94
	Corrected R-squared		4.37733e−002		Corrected R-squared		4.68188e−002
	Mean of Dependent Variable		6.36249		Mean of Dependent Variable		6.51707