2_a_driver_handbook
When two vehicles meet on a steep road where neither can pass , the vehicle facing downhill must yield the right - of - way by backing up until the vehicle going uphill can pass .

%3 0002_0001__When when[tmp] 0002_0004__meet meet 0002_0001__When->0002_0004__meet [restriction] 0002_0018__must must 0002_0001__When->0002_0018__must [scope] 0002_0002__two_0002_0003__vehicles two_vehicles 0002_0004__meet->0002_0002__two_0002_0003__vehicles [arg0] 0002_0006__a_0002_0008__road a_road 0002_0004__meet->0002_0006__a_0002_0008__road on[loc] 0002_0026__by by[mnr] 0002_0018__must->0002_0026__by [scope] 0002_0007__steep steep 0002_0006__a_0002_0008__road->0002_0007__steep [attrib] 0002_0010__neithe neither[quant] 0002_0011__can_0002_0012__pass can_pass 0002_0010__neithe->0002_0011__can_0002_0012__pass [scope] z_0002_1010 _ 0002_0010__neithe->z_0002_1010 [restriction] 0002_0011__can_0002_0012__pass->0002_0006__a_0002_0008__road [loc] 0002_0011__can_0002_0012__pass->z_0002_1010 [arg0] z_0002_1010->0002_0002__two_0002_0003__vehicles 0002_0016__facing facing 0002_0014__the_0002_0015__vehicle the_vehicle 0002_0016__facing->0002_0014__the_0002_0015__vehicle [arg0] 0002_0017__downhill downhill 0002_0016__facing->0002_0017__downhill [dir] 0002_0019__yield yield 0002_0026__by->0002_0019__yield [scope] 0002_0029__until until[tmp] 0002_0026__by->0002_0029__until [restriction] 0002_0019__yield->0002_0014__the_0002_0015__vehicle [arg0] 0002_0020__the_0002_0021__right the_right 0002_0019__yield->0002_0020__the_0002_0021__right [arg1] 0002_0025__way way 0002_0020__the_0002_0021__right->0002_0025__way of 0002_0027__backing_0002_0028__up backing_up 0002_0029__until->0002_0027__backing_0002_0028__up [scope] 0002_0034__can_0002_0035__pass can_pass 0002_0029__until->0002_0034__can_0002_0035__pass [restriction] 0002_0027__backing_0002_0028__up->0002_0014__the_0002_0015__vehicle [arg0] 0002_0030__the_0002_0031__vehicle the_vehicle 0002_0034__can_0002_0035__pass->0002_0030__the_0002_0031__vehicle [arg0] 0002_0032__going going 0002_0032__going->0002_0030__the_0002_0031__vehicle [arg0] 0002_0033__uphill uphill 0002_0032__going->0002_0033__uphill [clr][dir]
arc(r_0002_0001__When_tmp,r_0002_0004__meet,restriction).
arc(r_0002_0001__When_tmp,r_0002_0018__must,scope).
arc(r_0002_0004__meet,r_0002_0002__two_r_0002_0003__vehicles,arg0).
arc(r_0002_0004__meet,r_0002_0006__a_r_0002_0008__road,r_0002_0005__on__loc).
arc(r_0002_0006__a_r_0002_0008__road,r_0002_0007__steep,attrib).
arc(r_0002_0010__neither__quant,r_0002_0011__can_r_0002_0012__pass,scope).
arc(r_0002_0010__neither__quant,z_0002_1010,restriction).
arc(r_0002_0011__can_r_0002_0012__pass,r_0002_0006__a_r_0002_0008__road,loc).
arc(r_0002_0011__can_r_0002_0012__pass,z_0002_1010,arg0).
arc(r_0002_0016__facing,r_0002_0014__the_r_0002_0015__vehicle,arg0).
arc(r_0002_0016__facing,r_0002_0017__downhill,dir).
arc(r_0002_0018__must,r_0002_0026__by_mnr,keep_scope).
arc(r_0002_0019__yield,r_0002_0014__the_r_0002_0015__vehicle,arg0).
arc(r_0002_0019__yield,r_0002_0020__the_r_0002_0021__right,arg1).
arc(r_0002_0020__the_r_0002_0021__right,r_0002_0025__way,r_0002_0023__of).
arc(r_0002_0026__by_mnr,r_0002_0019__yield,scope_).
arc(r_0002_0026__by_mnr,r_0002_0029__until_tmp,restriction_).
arc(r_0002_0027__backing_r_0002_0028__up,r_0002_0014__the_r_0002_0015__vehicle,arg0).
arc(r_0002_0029__until_tmp,r_0002_0027__backing_r_0002_0028__up,scope_).
arc(r_0002_0029__until_tmp,r_0002_0034__can_r_0002_0035__pass,restriction_).
arc(r_0002_0032__going,r_0002_0030__the_r_0002_0031__vehicle,arg0).
arc(r_0002_0032__going,r_0002_0033__uphill,clr_dir).
arc(r_0002_0034__can_r_0002_0035__pass,r_0002_0030__the_r_0002_0031__vehicle,arg0).
arc(z_0002_1010,r_0002_0002__two_r_0002_0003__vehicles,z_0002_1008).


IP-MAT PP-SCON-TMP P-CONN When IP-ADV NP-SBJ NUM two NS vehicles VBP;~I meet PP-LOC P-ROLE on NP D a ADJP ADJ steep N road IP-REL ADVP-LOC RADV where NP-SBJ Q;_nphd_ neither MD;~cat_Vi can IP-INF-CAT VB;~I pass PUNC , NP-SBJ D the N vehicle IP-PPL VAG facing ADVP-DIR ADV downhill MD;~cat_Vi must IP-INF-CAT VB;~Tn yield NP-OB1 D the N right PUNC - PP P-ROLE of PUNC - NP N way PP-SCON-MNR P-CONN by IP-PPL2 VAG;~phr_Vp backing RP up PP-SCON-TMP P-CONN until IP-ADV NP-SBJ D the N vehicle IP-PPL VAG;~Ip going ADVP-CLR-DIR ADV uphill MD;~cat_Vi can IP-INF-CAT VB;~I pass PUNC .
( (IP-MAT (PP-SCON-TMP (P-CONN When;{when})
                       (IP-ADV (NP-SBJ;{VEHICLE} (NUM two;{two})
                                                 (NS vehicles;{vehicle}))
                               (VBP;~I meet;{meet})
                               (PP-LOC (P-ROLE on;{on})
                                       (NP (D a;{a})
                                           (ADJP (ADJ steep;{steep}))
                                           (N road;{road})
                                           (IP-REL (ADVP-LOC (RADV where;{where}))
                                                   (NP-SBJ;{VEHICLE} (Q;_nphd_ neither;{neither}))
                                                   (MD;~cat_Vi can;{can})
                                                   (IP-INF-CAT (VB;~I pass;{pass})))))))
          (PUNC ,)
          (NP-SBJ;{DOWNHILL_VEHICLE} (D the;{the})
                                     (N vehicle;{vehicle})
                                     (IP-PPL (VAG facing;{face})
                                             (ADVP-DIR (ADV downhill;{downhill}))))
          (MD;~cat_Vi must;{must})
          (IP-INF-CAT (VB;~Tn yield;{yield})
                      (NP-OB1 (D the;{the})
                              (N right;{right})
                              (PUNC -)
                              (PP (P-ROLE of;{of})
                                  (PUNC -)
                                  (NP (N way;{way}))))
                      (PP-SCON-MNR (P-CONN by;{by})
                                   (IP-PPL2 (VAG;~phr_Vp backing;{back[up]})
                                            (RP up;{up})
                                            (PP-SCON-TMP (P-CONN until;{until})
                                                         (IP-ADV (NP-SBJ (D the;{the})
                                                                         (N vehicle;{vehicle})
                                                                         (IP-PPL (VAG;~Ip going;{go[uphill]})
                                                                                 (ADVP-CLR-DIR (ADV uphill;{uphill}))))
                                                                 (MD;~cat_Vi can;{can})
                                                                 (IP-INF-CAT (VB;~I pass;{pass})))))))
          (PUNC .))
  (ID 2_a_driver_handbook))