Item dropped (headline run)	Traversette	Clapier	Mont-Cenis	Montgenèvre	Larche	Petit St B.	Grand St B.	Other col
None	29%	40%	16%	1%	3%	2%	<1%	9%
P1 The Island: four days beyond a crossing that is itself four days from the sea, at a confluence with a second river (mss Skaras/Skoras; Sarar/Arar), shaped like the Delta, with the Allobroges next to it	36%	34%	14%	2%	4%	1%	<1%	9%
P2 Then 800 stades in ten days along the river through flat country, escorted through the Allobroges, to the foot of the ascent	35%	34%	14%	2%	3%	1%	1%	10%
P3 The first fight is with the Allobroges, at the first defile of the ascent, with their town close by	40%	31%	12%	2%	4%	1%	<1%	10%
P4 Nine days from the foot of the ascent to the summit, with a battle, a captured town, a halt, a second ambush and a night in a gorge	30%	39%	15%	1%	3%	1%	<1%	10%
P5 The plains of the Po are pointed out from the summit camp (Polybius) or from a promontory on the first descent morning (Livy)	19%	32%	24%	3%	6%	3%	1%	12%
P6 Old snow from the previous winter lies under the new snow on the descent, at the setting of the Pleiades (29 Oct to 9 Nov)	19%	38%	23%	3%	5%	2%	<1%	9%
P7 The descent is narrow and steeper than the ascent, a cliff-path is broken away for 1.5 stades, and the plain is reached three days below the cliffs	25%	35%	18%	2%	5%	3%	<1%	11%
P8 He comes down among the Taurini and by "the pass through the Taurini" (Polybius 3.60.8, 34.10.18; Livy 21.38.5-7), not among the Salassi	32%	34%	14%	1%	4%	4%	1%	11%
P9 The crossing itself is "about 1,200 stades" (3.39.10) and takes fifteen days	25%	42%	17%	1%	3%	2%	<1%	10%
L1 Livy: from the Island left into the Tricastini, along the Vocontii into the Tricorii, across the Druentia, then a mostly level road to the Alps	18%	49%	20%	1%	2%	2%	1%	8%
T2 Varro lists Hannibal's pass between the coast road and Pompey's; Pompey says his own route was "other than Hannibal's"	20%	45%	18%	3%	2%	3%	1%	8%
T3 The Roman tradition Livy rejects: Coelius's Cremonis iugum, the popular Poeninus, Nepos's saltus Graius	29%	40%	16%	1%	3%	1%	<1%	9%
G1 The Traversette mire and rockfall (Mahaney and colleagues 2010-2026)	26%	42%	17%	1%	3%	2%	<1%	10%
F1 Practicable in early November for 30,000 men, thousands of animals and 37 elephants, and known as a route (Polybius 3.48.6: Gallic armies had crossed before)	45%	32%	9%	1%	2%	1%	<1%	10%